Smiddy- You're thinking of the DC Captain Marvel/Shazam. DC sued the creators of Captain Marvel saying he was too much a copy of Superman. They won but eventually bought the character.
They didn't do anything with the character for so long that Marvel Comics eventually came out with their Captain Marvel who was an alien Kree warrior.
Getting back to the X-Men, pretty much all super-heroes are banned by the JWs. Someone told my mom once when I was a kid buying them that the "uncanny" that's in the title, The Uncanny X-Men is a demon word. One of my favorites was Daredevil and they used the logic, "There's the word devil right there in the title!"