I know what's in those and know there are a variety of opinions about the Catholic Church among the various authors.The thing they have in common is that they all show what Hislop fabricated from lies and fantasies and the Hunt / He Who Cannot Be Named crowd repeat and put in comics is a just set of lies. A fantasy Hislop concocted to sell books and nothing more.
A lot of atheists make the same claim, that all Christian symbols and theology are warmed over pagan religions and rituals. You're free to join the atheists or anyone else you agree with and for whatever reason you like. Just don't pretend to have historical fact rather than opinions on your side when you base claims on what has been totally debunked many times over. Likewise, the opinions of a couple of anthropologists or even your own personal opinions of the Catholic Church don't constitute the sort of factual information those who blabber the Hislop lies claim to be relying on. Opinion is opinion, and fact is fact, when you have an opinion that's fine, but pretending that your opinion or a set of lies and fantasies is fact isn't fine.
I do hope you'll throw out anything you have with a cross on it, particularly any copy of the Bible you may have with a cross on the cover. Quite a few of the Hislop fans and those who claim everything in the Catholic Church is pagan to some degree also claim the cross is an ancient pagan symbol. Of course, Easter, Christmas, Valentines Day, and Sunday worship have to go as well, right along with the Christian canon of the Scripture.
I wasn't sure if you realized that one of the references you gave was not complimentary to the Catholic Church so I thought you might like to know this. Since I was making an endeavor to look into the references you gave I noticed this.
Nope...Nothing's been debunked...Just disagreed with, by your religion...