Despite what some people might think, Catholicism doesn’t advocate selling children into slavery. If it did, and Mr Rees Mogg still chose to be a Catholic, I very much doubt his constituents would have voted for him.
If there’s one thing I’ve learned from reading comments from both sides of the debate post-Brexit, is that for a large number of people their political party allegiances and hatreds trump many many other issues to the point of insanity.
For instance, Nick Clegg could come up with a way of giving everyone in the country a free solid gold house and there would be a portion of the electorate who went “yeah, but I could never vote for the Lib Dems because Tuition Fees.” Blair, Iraq. Corbyn, something he said back when the world was in black and white, and so on and so on. A lot of folk will vote Labour / LD / Tory simply because that’s who they vote for.
Never mind religion and child slavery, if Rees-Mogg advocated the eating of babies he’d probably still retain his seat in an election.