Jesus did. Christians are really the disciples of Jesus. Its just when they were in Antioch when they were first called christians which happened a short time after Jesus ascended to Heaven. It happened during the times they were being persecuted.
Acts 11:26 Holman Christian Standard Bible (HCSB)
26 and when he found him he brought him to Antioch. For a whole year they met with the church and taught large numbers. The disciples were first called Christians at Antioch.
There are continuous debates as to who founded Christianity. However, theologians accept that both Paul and Jesus played an instrumental role in Christianity teachings. Christianity as a religion is based on the life and teachings of Jesus, while Paul and other disciples were the ones who spread it.
It is generally accepted that it was Jesus Christ who has founded Christianity. around 27 AD, Jesus started teaching radical views(of the time period) that went against traditional Jewish beliefs. Jesus started gathering followers, ant thus, a new faith had spawned
Jesus was the founder. As for the religion, it was a gradual process, beginning slowly as a disliked cult after Jesus' execution. One milestone was when the Roman emperor Constantine converted to Christianity.
Someone who wanted to wipe Pagans off the face of the Earth. They modeled their demons and devils after our gods. Satan bears the horns of a goat, a direct resemblance to Pan, the god of nature. He also bears a trident, like Poseidon, the god of the seas.
The church began 50 days after Jesus' resurrection (c. A.D. 35). Jesus had promised that He would build His church (Matthew 16:18), and with the coming of the Holy Spirit on the day of Pentecost (Acts 2:1-4), the church-ekklesia (the "called-out assembly")-officially began. Three thousand people responded to Peter's sermon that day and chose to follow Christ. The initial converts to Christianity were Jews or proselytes to Judaism, and the church was centered in Jerusalem. Because of this, Christianity was seen at first as a Jewish sect, akin to the Pharisees, the Sadducees, or the Essenes. However, what the apostles preached was radically different from what other Jewish groups were teaching. Jesus was the Jewish Messiah (the anointed King) who had come to fulfill the Law (Matthew 5:17) and institute a new covenant based on His death (Mark 14:24). This message, with its charge that they had killed their own Messiah, infuriated many Jewish leaders. (cont in comments)
Christ-ianity: a relationship with God thru His Son Jesus. Learning His Teachings thru a new Commandment to love God and Love others as yourself and spreading the Gospel (birth, life, death, and resurection of Christ)into all the world. Bsptizing them in the name of the Father, Son and Holy Spirit! Paul and Jesus ' disciples started this in Antioch when they were first call Christians-(about the time of Pentecost-50 days after He arose! Jesus and Christianity changed the World!
CHRISTians means followers of CHRIST. ie Jesus Christ. He began his ministry at age 30 and those people who followed him abd believed his message were refered to as 'christ-ians' by non-believers first. It was meant to be derogatory but as time passed Christs folliwers embraced the name and made it their own. So Christianity technically began as soon as Christ began his ministry and gained followers so around 30 AD or so. Been around for nearly 2000 years now.
The founder of Christianity was Paul. Paul invented a new faith that had not existed before, and although it bears the name of Jesus, it is actually against anything Jesus stood for, which was pretty much Hillelite Phariseeanism. True, Jesus wasn't a good Jew, but he was still preaching many ideas very much in line with mainstream Judaism of his time. Paul changed all that, and I have no doubt Jesus would have opposed that.