An extensive site site tracking the religious affiliations of comic book characters. Examples:

Superman Methodist
Spider-Man Protestant
Batman Episcopalian/Catholic (lapsed)
Wonder Woman Greco-Roman Classical Religion
Captain America Protestant
The Hulk Non-Religious
The Thing Jewish
Daredevil Catholic
Wolverine former atheist
Elektra Greek Orthodox

The Religious Affiliation of Comic Book Characters.

(via Growabrain).