I went to a synagogue a few times back in 1970 or so and a Catholic church in May 2001....attended Presbyterian Sunday school as a wee kid.....can't say I was ever or am now a member/adherent of any of those persuasions tho.
He's noted at a website as a past adherent...doesn't make it fact however.
http://www.adherents.com/largecom/fa...ntologist.html