I checked that earlier this morning, Thomas was raised RC but attended an Episcopal church with his wife, he returned to the Catholic Church sometime later.
You're right. He left the church after his divorce but was later reconciled.
I have no problem with any Justice's religion. And we have a constitution that forbids religious tests for any federal office. We could have a nine member court made up of snake handlers from WV, as long as they interpret the Constitution as written I'd be ok with that.