The website adherents.com is a place where you can find statistics of faith organizations, and religious geography. You can even find faith stats on the comic book world. On this site you can search a character by name, or search by religion/denomination to find out all the characters that belong to that faith.
All of their information is gathered by directly from the pages of actual comic books as well as external sources such as online discussions out of reputable forms like animationinsider.net/forums.
It also has information on topics such as; which major mainstream superheroes are most consistently portrayed as overtly religious, Superheroes who are Clergy or Religious Leaders, and the Comics Code and the Religion Taboo.
Here is a sample of some Superhero’s, and their religious affiliation:
Some Top Super-Heroes
Superman - Methodist
Spider-Man- Protestant
Batman - Episcopalian/Catholic (lapsed)
Wonder Woman- Greco-Roman Classical Religion
Aquaman - Greco-Roman Classical Religion
The Hulk - Catholic (lapsed)
Captain America- Protestant
Invisible Woman - Episcopalian
Nightcrawler- Catholic
Shadowcat- Jewish
Daredevil- Catholic
Hawkman - Egyptian classical religion
The Thing- Jewish
The Atom - Jewish (lapsed)
Zatanna - Dianic Wiccan
Elektra - Greek Orthodox
Visit the site for more detail on these, and other comic characters.