Christianity is the most widely practiced religion in the world, with more than 2 billion followers. The Christian faith centers on beliefs regarding the birth, life, death and resurrection of Jesus Christ. While it started with a small group of adherents, many historians regard the spread and adoption of Christianity throughout the world as one of the most successful spiritual missions in human history.

πŸ“š Christian Beliefs

Some basic Christian concepts include:

Christians are monotheistic, i.e., they believe there’s only one God, and he created the heavens and the earth. This divine Godhead consists of three parts: the father (God himself), the son (Jesus Christ) and the Holy Spirit.

↴ The essence of Christianity revolves around the life, death and Christian beliefs on the resurrection of Jesus. Christians believe God sent his son Jesus, the messiah, to save the world. They believe Jesus was crucified on a cross to offer the forgiveness of sins and was resurrected three days after his death before ascending to heaven.

↴ Christians contend that Jesus will return to earth again in what’s known as the Second Coming.

↴ The Holy Bible includes important scriptures that outline Jesus’s teachings, the lives and teachings of major prophets and disciples, and offer instructions for how Christians should live.

↴ Both Christians and Jews follow the Old Testament of the Bible, but Christians also embrace the New Testament.

↴ The cross is a symbol of Christianity.

↴ The most important Christian holidays are Christmas (which celebrates the birth of Jesus) and Easter (which commemorates the resurrection of Jesus).

πŸ“š Who was Jesus?

Most historians believe that Jesus was a real person who was born between 2 B.C. and 7 B.C. Much of what scholars know about Jesus comes from the New Testament of the Christian Bible.

According to the text, Jesus was born to a young Jewish virgin named Mary in the town of Bethlehem, south of Jerusalem in modern-day Palestine. Christians believe the conception was a supernatural event, with God impregnating Mary via the Holy Spirit.

Very little is known about Jesus’s childhood. Scriptures reveal that he grew up in Nazareth, he and his family fled persecution from King Herod and moved to Egypt, and his “earthly” father, Joseph, was a carpenter.

Jesus was raised Jewish, and according to most scholars, he aimed to reform Judaism—not create a new religion.

When he was around 30 years old, Jesus started his public ministry after being baptized in the Jordan River by the prophet known as John the Baptist.

For about three years, Jesus traveled with 12 appointed disciples, teaching large groups of people and performing what witnesses described as miracles. Some of the most well-known miraculous events included raising a dead man named Lazarus from the grave, walking on water and curing the blind.

πŸ“š Jesus’s Teachings

Jesus used parables—short stories with hidden messages—in his teachings.

Some of the main themes that Jesus taught, which Christians later embraced, include:

Love God.
 Love your neighbor as yourself.
 Forgive others who have wronged you.
 Love your enemies.
 Ask God for forgiveness of your sins.
 Jesus is the Messiah and was given the authority to forgive others.
 Repentance of sins is essential.
 Don’t be hypocritical.
 Don’t judge others.
 The Kingdom of God is near. It’s not the rich and powerful—but the weak and poor—who will inherit this kingdom.

In one of Jesus’s most famous speeches, which became known as the Sermon on the Mount, he summarized many of his moral instructions for his followers.

πŸ“š Jesus’s Death and Resurrection

Many scholars believe Jesus died between 30 A.D. and 33 A.D., although the exact date is debated among theologians.

According to the Bible, Jesus was arrested, tried and condemned to death. Roman governor Pontius Pilate issued the order to kill Jesus after being pressured by Jewish leaders who alleged that Jesus was guilty of a variety of crimes, including blasphemy.

Jesus was crucified by Roman soldiers in Jerusalem, and his body was laid in a tomb. According to scripture, three days after his crucifixion, Jesus’s body was missing.

In the days after Jesus’s death, some people reported sightings and encounters with him. Authors in the Bible say the resurrected Jesus ascended into Heaven.

πŸ“š The Christian Bible

The Bible comprises the whole 73-book canon recognized by the Catholic Church, including the deuterocanonical books. It’s divided into two parts: The Old Testament and the New Testament.

The Old Testament, which is also recognized by followers of Judaism, describes the history of the Jewish people, outlines specific laws to follow, details the lives of many prophets, and predicts the coming of the Messiah.

The New Testament was written after Jesus’s death. The first four books—Matthew, Mark, Luke and John—are known as the “Gospels,” which means “good news.” These texts, composed sometime between 70 A.D. and 100 A.D., provide accounts of the life and death of Jesus.

Letters written by early Christian leaders, which are known as “epistles,” make up a large part of the New Testament. These letters offer instructions for how the church should operate.

The Acts of the Apostles is a book in the New Testament that gives an account of the apostles’ ministry after Jesus’s death. The author of Acts is the same author as one of the Gospels—it is effectively “part two” to the Gospels, what happened after Jesus’s death and resurrection.

The final book in the New Testament, Revelation, describes a vision and prophecies that will occur at the end of the world, as well as metaphors to describe the state of the world.

πŸ“š The Early Church, Sts. Peter and Paul

Christ Delivering the Keys of the Kingdom to Saint Peter, Sistine Chapel, Vatican, Rome, Italy, 1481-1483
Peter is important for the history of Christianity for two reasons. First, he is generally treated as a model for Christians to follow. This may sound strange at first because the gospels relate many examples of Peter’s faithlessness—for example, his three denials of Jesus. Because of the varied traits ascribed to Peter, he may be the most fleshed-out character in the gospels.

Yet Peter’s failings are treated as symptoms of man’s state of sinfulness or weakness which can be overcome through faith in Jesus. Peter did just this because, after Jesus’ resurrection, he traveled widely to preach Jesus’ message and convert people to Christianity. In Acts, Peter is portrayed as a model disciple for others to emulate.

He is also important because the gospels describe Jesus as calling Peter his “rock” upon which the future church would be built. He was the first to begin preaching to the gentiles. Because of Peter’s martyrdom in Rome, traditions developed which led to the belief that the most important Christian church organization was located in Rome—not in cities like Jerusalem or Antioch where Christianity was older or where Jesus actually visited. Because Peter was given a unique leadership role, the places where he was martyred has taken that role over and popes today are regarded as the successors of Peter, the first leader of the Roman church.

According to the Bible, the first church organized itself 50 days after Jesus’s death on the Day of Pentecost—when the Holy Spirit was said to descend onto Jesus’s followers.

Most of the first Christians were Jewish converts, and the church was centered in Jerusalem. Shortly after the creation of the church, many Gentiles (non-Jews) embraced Christianity.

Early Christians considered it their calling to spread and teach the gospel. One of the most important missionaries was the apostle Paul, a former persecutor of Christians.

Paul’s conversion to Christianity after he had a supernatural encounter with Jesus is described in Acts of the Apostles. Paul preached the gospel and established churches throughout the Roman Empire, Europe and Africa.

Many historians believe Christianity wouldn’t be as widespread without the work of Paul. In addition to preaching, Paul is thought to have written 13 of the 27 books in the New Testament.

πŸ“š Persecution of Christians

Early Christians were persecuted for their faith by both Jewish and Roman leaders.

In 64 A.D., Emperor Nero blamed Christians for a fire that broke out in Rome. Many were brutally tortured and killed during this time.

Under Emperor Domitian, Christianity was illegal. If a person confessed to being a Christian, he or she was executed.

Starting in 303 A.D., Christians faced the most severe persecutions to date under the co-emperors Diocletian and Galerius. This became known as the Great Persecution.

πŸ“š Constantine Embraces Christianity

When Roman Emperor Constantine converted to Christianity, religious tolerance shifted in the Roman Empire.

During this time, there were several groups of Christians with different ideas about how to interpret scripture and the role of the church.

In 313 A.D., Constantine lifted the ban on Christianity with the Edict of Milan. He later tried to unify Christianity and resolve issues that divided the church by establishing the Nicene Creed.

Many scholars believe Constantine’s conversion was a turning point in Christian history.

πŸ“š The Catholic Church

In 380 A.D., Emperor Theodosius I declared Catholicism the state religion of the Roman Empire.

The Pope, or Bishop of Rome, operated as the head of the Roman Catholic Church.

Catholics expressed a deep devotion for the Virgin Mary, recognized the seven sacraments, and honored relics and sacred sites.

When the Roman Empire collapsed in 476 A.D., differences emerged among Eastern and Western Christians.

In 1054 A.D., the Roman Catholic Church and the Eastern Orthodox church split into two groups.

πŸ“š The Crusades

Between about 1095 A.D. and 1230 A.D., the Crusades, a series of holy wars, took place. In these battles, Christians fought against Muslims to reclaim holy land in the city of Jerusalem.

The Christians were successful in occupying Jerusalem during some of the Crusades, but they were ultimately defeated.

After the Crusades, the Catholic Church’s power and wealth increased.

πŸ“š The Reformation

In 1517, a German monk named Martin Luther published 95 Theses—a text that criticized certain acts of the Pope and protested some of the practices and priorities of the Catholic church.

Later, Luther publicly said that the Bible didn’t give the Pope the sole right to read and interpret scripture.

Luther’s ideas triggered the Reformation—a movement that aimed to reform the Catholic church. As a result, Protestantism was created, and different denominations of Christianity eventually began to form.

πŸ“š Christian Denominations

Christianity is broadly split into three branches: Catholic, Protestant, and (Eastern) Orthodox.

The Catholic branch is governed by the Pope and Catholic Bishops around the world. The Orthodox (or Eastern Orthodox) is split into independent units each governed by a Holy Synod; there is no central governing structure akin to the Pope.

There are numerous denominations within Protestant Christianity, many of which differ in their interpretation of the Bible and understanding of the church.

Some of the many denominations that fall under the category of Protestant Christianity include:

↷ Episcopalian
↷ Non-Denominational
↷ Evangelist
↷ Methodist
↷ Presbyterian
↷ Pentecostal/Charismatic
↷ Lutheran
↷ Anglican
↷ Evangelical
↷ Assemblies of God
↷ Christian Reform/Dutch Reform
↷ Church of the Nazarene
↷ Disciples of Christ
↷ United Church of Christ
↷ Mennonite
↷ Christian Science
↷ Quaker
↷ Seventh-Day Adventist

Although the many sects of Christianity have differing views, uphold separate traditions, and worship in distinct ways, the core of their faith is centered around the life and teachings of Jesus.

Christianity Fast Facts. CNN.
The Basics of Christian History. BBC.
Christianity. BBC.
Death and Resurrection of Jesus. Harvard Divinity School.
Life and Teachings of Jesus. Harvard Divinity School.
Legitimization Under Constantine. PBS.

⛪  Catholic Beliefs :

πŸ“œ The Two Great Commandments
πŸ“œ The Ten Commandments
πŸ“œ The Chief Commandments or Laws of the Church
πŸ“œ The 7 Sacraments (The Mysteries)
πŸ“œ The 7 Corporal Works of Mercy
πŸ“œ The 7 Spiritual Works of Mercy
πŸ“œ The 3 Eminent Good Works
πŸ“œ The 7 Gifts of the Holy Spirit
πŸ“œ Class of Gifts of the Holy Spirit known as Charismata
πŸ“œ The 12 Fruits of the Holy Spirit
πŸ“œ The 3 Theological Virtues
πŸ“œ The 4 Cardinal Virtues
πŸ“œ The 3 Evangelical Counsels
πŸ“œ The 6 Precepts of the Church
πŸ“œ The 3 Powers of the Soul
πŸ“œ The 4 Pillars of the Catholic Faith
πŸ“œ The 3 Pillars of the Church's Authority
πŸ“œ The 3 Duties of the Ordained
πŸ“œ The 3 Parts of the Church
πŸ“œ The 4 Marks of the Church
πŸ“œ The 12 Apostles
πŸ“œ The 12 Tribes of Israel
πŸ“œ The 8 Beatitude
πŸ“œ The 9 Choirs of Angels
πŸ“œ The 4 Last Things to Remember

Sins :

πŸ“ƒ The 7 Deadly Sins
πŸ“ƒ Four Sins Crying to Heaven
πŸ“ƒ The 6 Sins Against the Holy Spirit
πŸ“ƒ 9 Ways of being accessory to another's Sin
πŸ“ƒ Mortal Sin & Venial Sin
πŸ“ƒ 3 Conditions For Mortal Sin
πŸ“ƒ 7 Failures which few people take into account
πŸ“ƒ 7 Disguises in which God frequently sends his Grace
πŸ“ƒ Gaining Indulgence

 Sacramentals :

Three things make a Sacrament; the conferring of inward grace, by an outward sign, in virtue of divine institution. Thus in Baptism the pouring of water is the outward sign, and by it habitual, or sanctifying, grace is infused into the soul, because of Christ's institution. Now the Sacramentals, like the Sacraments, have an outward sign or sensible element, but unlike them, they are mostly of ecclesiastical origin, and do not, of their own power, infuse grace into the soul, but only excite it to desires whereby it may obtain from God's gratuitous mercy that grace or its increase. Holy Water is a Sacramental, but, of its own nature, it washes not the soul from sin and pours not grace into it, as do the waters of Baptism. If, however, a person uses it devoutly, it will, on account of the Church's blessing attached to it, assist his will in forming pious desires. 

The Sacramentals may be arranged under two heads — 
" The Prayers of the Church " and 
" The Benedictions of the Church." 

πŸ“ƒ Holy Water
πŸ“ƒ Holy Oil
πŸ“ƒ Blessed Candles
πŸ“ƒ Holy Ashes
πŸ“ƒ The Cross and the Crucifix 

Scapulars :

πŸ“‹ Introduction on Scapulars
πŸ“‹ The Brown Scapular
πŸ“‹ The Blue Scapular
πŸ“‹ The Red Scapular
πŸ“‹ The Green Scapular
πŸ“‹ The White Scapular
πŸ“‹ The Scapular of Saint Joseph
πŸ“‹ The Five Fold Scapular
πŸ“‹ The Scapular of the Seven Sorrows

Weekly Devotions :

πŸ“•  Sunday        : The Holy Trinity
πŸ“•  Monday       : The Souls in Purgatory
πŸ“•  Tuesday       : Our Guardian Angels
πŸ“•  Wednesday : Saint Joseph
πŸ“•  Thursday     : The Eucharist
πŸ“•  Friday           : The Passion of Jesus (Divine Mercy) and/or The Sacred Heart of Jesus
πŸ“•  Saturday       : The Immaculate Heart of Mary

Monthly Devotions :

πŸ“’ January: The Holy Childhood of Jesus
πŸ“’ February: The Holy Family
πŸ“’ March: Saint Joseph
πŸ“’ April: The Blessed Sacrament
πŸ“’ May: Our Lady
πŸ“’ June: Sacred Heart of Jesus 
πŸ“’ July: The Precious Blood of Jesus
πŸ“’ August: The Immaculate Heart of Mary (the Assumption of Mary)
πŸ“’ September: The Seven Sorrows of Mary
πŸ“’ October: The Holy Angels and the Holy Rosary
πŸ“’ November: The Poor Souls in Purgatory
πŸ“’ December: The Immaculate Conception

Days each of the Rosary Mysteries are Prayed :

πŸ“— Sunday: The Glorious Mysteries
πŸ“— Monday: The Joyful Mysteries
πŸ“— Tuesday: The Sorrowful Mysteries
πŸ“— Wednesday: The Glorious Mysteries
πŸ“— Thursday: The Luminous or Joyful Mysteries
πŸ“— Friday: The Sorrowful Mysteries
πŸ“— Saturday: The Joyful Mysteries (or Glorious Mysteries after 3pm)