Well, you're the one who asked for information on the belief-not me. I can't argue whether it is true or not simply because I have not read through the stacks of books. All I'm doing is trying to look at the material objectively.
I have some doubts and have express them but I don't think you or I have the evidence necessary to totally reject the author's premise. To accurately verify his information we would have to trace every single Christian group and their beliefs throughout the history outside of the Church-an impossible task. I can't even keep my telephone numbers organized. This is like tracing the lost tribe of Israel or Noah's Ark in my mind.
No, we don't have to do anything. The theory is that a "blood trail" exists. Let him show me.
I know you are not arguing his case.