Kathryn
It was on fire when I laid down on it.
Kathryn have you ever read any of Timothy Freke/Peter Gandy's books. They are a very good resource to learn about this subject. They've done a lot of research into the subject. Some of their books are the "Laughing Jesus", "Jesus and the Lost Goddess" and the "Jesus Mysteries. Some older books are Alvin Kuhn "Who is this King of Glory? A critical Study of the Christos-Messiah Tradition, any of his are interesting, Godfrey Higgins "Anacalypsis: An Attempt to Draw Aside the Veil of the Saitic Isis; or an Inquiry into the Origin of Languages, Nations and Religions, Vol. I and II and Gerald Massey "Ancient Egypt, the Light of the World, Volumes I and II. Some of these are quite old and may have to be ordered in from Universities at your local library. All are amazingly informative.
That's good enough information, but i really am looking for texts and art that PREDATE Christianity that support these theories. I would prefer not having to go to a library to find them - you would think that online there would be some specific sources mentioned. For instance, I can google Josephus or Tertullian or the Talmud and I get thousands of pages of info discussing very specific documents, evidence, etc - but I can't find any specific sources that predate Christianity listed anywhere.
The books you mentioned seem to be 20th century works - is that right? They may include some sources but you would think that if these sources were legitimate we would be able to find them discussed online somewhere.