How did Christianity happened?

Answer 1

Big question, the big answer is the Jewish religion was overthrown but the feeling
of the Jewish law was kept not ridiculed, so Jesus skillfully injected enough love
and compassion to resurrect the dead. The opinions are many, so lets look at some
facts:
1. Christianity is a word and religious idea that emerged after the walk of the man
Christ. The Christ was consumed with talking to his father, and wanted that for all
men and women, not a Church building with a title.
2. The Collapse of all known religions including the best civilizations, there was a lot
of fighting and struggling and a dark age. Little civil writings were made and Christianity
emerged as a powerful and kingdom building power.
3. The emergence from the Dark Ages, into freedom in art, and music and speech, and
finally the individual having independent ideas of religion and God communication is
sometimes unpunished.

Answer 2

The teachings of Christianity are based on the life death and resurrection of Jesus Christ, so Christianity did not begin until after Jesus was crucified and rose from the dead.

After His resurrection Jesus spent 40 days with His disciples and during this time he presumably taught them about the purpose of His life and death. This verse is from the New Testament of The Bible:

Acts 1:3 to whom He also presented Himself alive after His suffering by many infallible proofs, being seen by them during forty days and speaking of the things pertaining to the kingdom of God.

When Jesus left this world He told His disciples to go into the world and tell and teach people about Him and so Christianity spread throughout the known world.

Over the years men have added their own traditions and rules etc to Jesus' teaching however there are many people in the world who adhere to the teaching of the Bible.