There is a small and extreme faction of Baptists who believe that Catholicism is from the Devil. As far as I know, the vast majority of Protestants, including most Baptists, do not ascribe to that view. We may have our doctrinal disagreements, but we're all Christians. This kind of thing is just silly.
I've never seen any argument based on Catholicism being from the Devil, but I have seen a lot of other (More realistic and LOTS more reasonable) arguments.
Note that this is an "independent" Baptist church.