... i would say that it was designed.
Try and imagine you are back in the first century, you would find many people who believe in a man called Jesus but most of them have different beliefs about who or what Jesus was.
Small groups of people begin to take shape, people with similar views of who Jesus was. These groups then start writing texts about Jesus, some of them write biographical gospels, others collate sayings attributed to Jesus, still others write pure mythology centred on Jesus. We end up with various groups who all call themselves Christian but have very different beliefs and use very different religious texts.
Now skip forward to the second century, we have one group that stands out from the others as it is the largest and most organised. This group of people share a common set of beliefs, that Jesus was the son of God, that he died and was resurrected, and that by believing in his sacrifice and resurrection they will receive eternal reward.
This group collected together those texts that supported their view of Jesus, rejecting the vast majority of what had been written. They chose four similar gospels and several letters which supported their Christology, eventually one apocalyptic text was chosen to complete the canon.
This carefully constructed new testament canon portrays Jesus in a specific manner and delivers a specific message. With the addition of the Jewish Tanach we get todays Holy Bible.
The Holy Bible is the template for one form of Christianity, all other literature is declared heretical and other Christian religions are supressed and eventually destroyed - the Bible becomes the only source for Christians and Christian converts, the orthodox form of Christianity becomes the only form of Christianity avaliable. - Halcyon
Hey Halcyon... Try and imagine this! You and a group of 11 people just "designed" a religion. Hell, one of you betrayed the deity that you designed, and later committed suicide because of the guilt. You all write your designed testimonies, trying to convince people that your deity exists, and should be worshiped.
Than later on you die for your designed story, and your designed deity, even though you profit nothing from it, and gain only death. Death and enormous pain...