According to the Catholic Encyclopedia, The gospels names of Matthew, Mark, Luke and JOhn do not necessarily indicate authorship. We are very confident they were written around 4 AD.
Now, a large part of this argument is the striking simularities between Jesus and Buddha, Osiris and others , ie : Osiris was the light of the world, he walked on water, came to save us from our sins, had 12 disciples and a last supper, though it wasn't bread it was something else ( I don't have my notes to hand.) The reason these points are relevant is because it is almost as if Jesus could have been pieced together from a load of "pagan" gods - the stories are too similar, even his sayings are paraphrases of Buddas words. SO COULD HE HAVE BEEN INVENTED BY THE CHURCH ?
Well, the time he lived was one of great upheavel politically , in fact the Jews were a huge threat to the Romans, and Pontius Pilate was quite a dictator, so allowing his crucifiction was a little out of character, as he was the sort to crush any sort of riot, upheavel, and not the kind of man to shrink down to demands.
Jesus words to go " buy swords " which still remain in scripture, his death on the cross / stake ( very quick - unusual) the handling of a dead body on the passover with the items taken to him after in the cave were for treating injuries, not embalming. It is very likely to me that he may not have been the son of God but something quite different, as his crucifiction ( for sedition ) would indicate.
OF COURSE, this could be Satans greatest trick to mislead us all from selling the Watchtower, in which case Why isn't it much better known ?