I always have to laugh when Catholics actually find out what some Protestant denominations think of them. Most Protestant denominations up until 50-60 years ago or so were anti-Catholic to one extent or another, and while a great deal of work has been done via the ecumenical movement, the fact is that I’ve personally known several Baptists, Pentecostals, Seventh Day Adventists and Jehovah’s Witnesses who are virulently anti-Catholic.
I grew up in the JW religion, and the poster someone posted above was only slightly more over the top than some of the JW literature on the topic of Catholicism. The JW’s adopted that lovely Protestant canard of the Church being the “whore of Babylon”. Attacking Catholics was almost a weekly thing when I was a kid, though I hear through the grapevine they’ve sort of backed off on that (maybe now that the JWs have their own child abuse scandal going on, they’re not feeling quite so arrogant on that topic).