Christianity is one of the three major religions in the world and a traditional belief with a long history. This is a very common concept in Europe, South America, North America and Australia. Christian belief is basically to love God and others, which is the soil foundation of western fraternity culture and has nothing to do with terrorist organizations.

Christianity developed and grew in the spread of disciples after Jesus ascended to heaven, first in the Middle East, then all over Europe, and then moved to America and Australia with the prosperity of Europe. During the feudal society in Europe, it split into Catholicism and Orthodox Church, and began to enter an artificial dark period. The theory was misinterpreted and became a tool of imperial power. Later, after Father Martin Luther's reform, more people began to read the Bible by themselves, and the truth was gradually understood by people, restoring the early teachings of Christianity and returning to the right path of God's revelation. This is Christianity now.

I'll be brief. You can find more detailed information online.