After Jesus' crucifixion, Saul was travelling on the road to Damascus when he was struck blind and had a vision and conversation with the resurrected Jesus -- at least according to the official Christian dogma on the subject. None of his travelling companions experienced this vision, as the only accounts of this come from Saul, himself. As the story goes, however, Saul changed his name to Paul, became the most fervent follow, and Christians take this fervency as evidence of his conversion to the one true word. He then went on to establish this new religion Christianity.
My question, however, has to do with the source. Since the only source for this epiphany is Saul, himself, and Saul was a very fervent enemy of Jesus' followers, what if he saw an opportunity to co-opt the very movement he hated so as to put his own stamp on it?
Jesus, Himself is reported to have warned His followers to beware false prophets and so my own interpretation of this Religion is that it is Jesus who should be front and center and not Paul. Jesus said "Believe in ME" rather than Paul or anybody else, and so when Christians follow Paul, they are following a religion that may be about Jesus, but they really aren't following Jesus. They are following Paul.
I suppose if I were to refer you to anything, it might be the Red Letter Christians or similar movements, though.