Somebody forgot about "thou shalt not bear false witness against thy neighbour".
The man is either a liar or an idiot.
If he's anything like the anti-Catholic FReepers we encounter every day (and what I used to be like), he's so certain of his position that he feels he has the right to impose it on the rest of us. Obviously, he doesn't think he's bearing false witness (but we know otherwise).
My old pastor used to express pride in how he'd refuse to attend prayer events that included Catholics.