It is a good question. But I think you have to consider that it took centuries for Christianity to congeal into the religion we now know it to be. Jesus may have been the instigator. But he was far from the first and the last word on Christianity. Two, it appears Jesus was a bit of a mystic (e.g. Matthew 13: 11He replied, “Because the knowledge of the secrets of the kingdom of heaven has been given to you, but not to them. 12Whoever has will be given more, and they will have an abundance. Whoever does not have, even what they have will be taken from them. 13This is why I speak to them in parables) And mystics never profane the sacred by writing it down. The sacred is always given to the worthy and not the unworthy.