I'm ex-catholic but not quite sure the "we want to be free to oppress catholics" narrative quite holds up in the case of the trump admin.
The current supreme court has 6 catholic justices, with 2 appointed by trump. 2 of them rubber stamp everything trump does (alito and thomas), and most of the others support him more often than not (rogers, coney-barrett, kavanaugh). Only sotomayor opposes him frequently.
If you covertly (or not) want to oppress a religion why stack the highest court in the country with people from said religion?