a) slanderous comments, some by devout athiests and some by Christians of various denominations, against the character and nature of the RCC and the Pope (ie "they have every reason to lie"), and
b) positive assumptions and character references about Rivera and Jack Chick (ie "they have no reason to lie").
In other words, the "defense" relies almost exclusively on the same tactics the RCC is accused of using, namely character assassination.
Well, I'm all for turning the other cheek. I like few words and letting your yea be yea and your nay/nay. When you say that it contains slander, well, maybe yes. But, slander does not necessarily mean incorrect or untrue. Consider Jesus addressing the religious charlatans of that time (i.e. "you vipers"). They hated Him for it. They were blinded by the devil, the world, the flesh and, were more concerned with how they looked in others eyes than in God's.
Yep, it kinda reminds me of Bill Clinton and Kathleen Willey. One of 'em is lying and one of 'em is telling the truth.