"I don't know why I never knew that."
Probably because he was an Episcopal until some of the more absurd liberal nonsense started coming out of ECUSA.
That makes sense.
Actually, Thomas was brought up Catholic; at his (judicial) confirmation, they kept showing his parents' Catholic Charismatic prayer group. He even went to Catholic school. As a young man, he explored many different philosophies and faiths, and gradually returned to the Catholic Church by way of the Episcopal Church.