Maria de Guadalupe Santiago, better known as the superheroine "Silverclaw", was born into the Kamekeri tribe. She was baptized as an infant and raised in the Catholic Church. Her father also taught her about the pre-Christian religious beliefs of her people, which combined Incan religion with their own local gods.

Eventually Maria learned that Peliali, the volcano goddess of the Kamekeri people, is her true mother. This godly heritage is the source of Silverclaw's super powers.

Discussion

From: "Atheist representation on the Avengers" forum discussion started 20 June 2001 on "Comic Boards" website (http://www.comicboards.com/avengers/view.php?trd=010620110715; viewed 24 May 2007):

Posted by Jae on Wednesday, June 20 2001 at 11:07:15 GMT

Atheist representation on the Avengers

The teams pretty well rounded now, but are there any atheistic members?...

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[http://www.comicboards.com/avengers/view.php?rpl=010620201053]

Posted by D-Man on Wednesday, June 20 2001 at 20:10:53 GMT

...Probably the best comic you could find to figure out who believes in a god or a god, or have deep faith in God or a god would be:

Infinity Crusade
The Goddess uses the heroes' faith and belief in gods and such to recruit heroes.

Here are a list of Avengers who are "believers" so are recruited by the Goddess:
Living Lightning
Black Knight
Hercules
Sersi
Invisible Woman
Spider-Man
Quicksilver
Wonder Man
Captain America
Thor
Crystal
Moondragon
USAgent
Scarlet Witch
Moon Knight

...Other Avengers I'm guessing might be "believers":
Silver Claw [i.e., Silverclaw]
Triathlon
Justice

All other Avengers are up in the air.

See also:
http://www.marvunapp.com/Appendix/silvclaw.htm
http://www.marvel.com/universe/Silverclaw