No one. The bible is made up of different stories or 'books' that were written by anonymous authors over an x number of years.
Another Answer:
The term 'christianity' is not in the Scripture but given by men. It simply means a follower of Jesus Christ. The Bible speaks of the Old Testament/Covenant and the Congregation of Israel. The New Testament/Covenant has the Church of God. In the OT, the followers were physical Israel, in the NT the followers are spiritual Israel (and many physical Israel but they lost their identity and do not know their ancestry).
All Scripture has been given by God, inspiring different men at different times to record events. The God member of the OT was called the Word and the NT calls this God Family person, Jesus Christ. One and the same and only member that mankind has seen.
The Cross
Vedic religion popularly known as Hindu religion. Taking cue from this religion, Buddhism, Jainism, Sikhism and many more have come up and established. And all the three were founded by noble saints, and have millions of followers.
Judaism
They are called christians.
Jesus
its a religion it means christian
The people worship in a church.
They persecuted it, and tried to stop it.
it was influenced by judaism
Christ's teachings and miracles.
Chrisianity
he invented chrisianity