I'm sure that to some there is a conflict between Christianity and Paulianty, but with the overall lack of Christian good will displayed by the anti-Catholics I suspect this has nothing to do with religion at all. I think it is filling the void left in their lives by the collapse of racism as an acceptable feel good outlet within their limited culture and circles. There always has to be a "them" to hate and being anti-Catholics doesn't bring down the PC police like hating blacks and Jews.
The basis of the Reformation rests largely on first millennium heresies among which Paulianity is prominent. The Reformation was a repudiation of Christianity and that meant that they left no heretical stones unturned in the development of their various doctrines. Which, of course, immediately diverged in all directions, as individual men discovered that suddenly all stops were out; there was no Church and you could come up with whatever beliefs that you wanted, with no limit on the imagination.
The antiCatholics here are simply following in their own sacred tradition of antiCatholicism. Look at the incessant antiCatholicism of the 1800s in the US, Canada and the UK for evidence of that.