Chiming in, I agree Tarot is not pre-Christian, although I believe many of the ideas presented in it are archetypal influences handed down through the centuries. I've quoted Joseph Campbell in other posts, but he posits a theory that many, if not most, of the world's stories stem from the same root "Hero's Journey" in which, roughly speaking, the hero is presented with a problem, receives so-called magic talismans, enchanted swords and knowledge to fulfill his mission, the purity of his intentions is tested and in the end he succeeds in slaying the dragon and returns with a boon to his community. I agree with this, as the same sort of mold can be found in literature to this day. The Dying God is one such example which has been repeated endlessly (The Catcher in the Rye could be seen as a parable about Jesus/Osiris, but so could Alice in Wonderland, as well as Noah's Ark. Joseph could actually be a Jesus-prototype as the similarities are striking). One doesn't even have to plan a work to "fit" the structure for it to happen. La Papess, Isis, Mary, Ruth... they are in many ways the same person. Even concepts such as doomed lovers weren't invented by Shakespeare, he just did it better.
However, although this is, hypothetically, apparent even in modern storytelling and even in the accepted (although it did go through many permutations) structure of the Tarot deck, it still does not show evidence of antiquity. Transformers follows the same structure, although I hope no one would suggest that is pre-Christian.