Yeah Nick was raised Catholic (I believe even Confirmed), but he and Kayla are whatever now. I can't find it on a quick search, but for a while it was coocoo Lutherans and now it's whatever non-denominational that is even too strict for Rackets. I was supposing he had residual Catholic guilt, but let's be real- this guy feels no guilt for his actions.
And edit for clarity: for a time, Nick was being called tradcath for whatever reason here. Tradcaths are the Latin Mass, pre-Vatican II or even pre-Vatican I people. Nick is far from that. I think the general intent was he was presenting as a trad-con Christian, in particular when he'd go on with Doug T or the chad dads panels. But we now know, he doesn't even believe in the divinity of Christ, much less the Trinity. Or you know, even observing the Sabbath in any way beyond turning on a stream.