I think they don't, Mags not for decades, and Kitty/Kate not for years. Really, human religions might no longer have a place in Krakoa, where Mags seems to be proposing mutants worship only themselves and one another.
Kitty throwing away her daddy's faith as a silly sapiens notion would make sense given how she's driven to be so un-Kosher as can be in the Marauders.