P.Z. Myers at Pharyngula points out Godchecker’s “Your Guide to the Gods,” a searchable database of over 2,850 gods. You can search by pantheon (African, Australian, Aztec, Caribbean, Celtic, Chinese, Egyptian, Finnish, Greek, Incan, Japanese, Mayan, Mesopotamian, Middle Eastern, Native American, Norse, Oceanic, Roman, Slavic and Baltic, South American, and Southeast Asian), look at the Deity of the Day (available via RSS feed), read feature articles, or purchase items from the God Shop. There are also collections of links to other resources on mythology.
As Myers observes, you can make the point that evangelical Christians are atheists with respect to all but one of the listed gods. (Actually, the database lists Jehovah, Yahweh, YHWH, God, and Jesus individually, as well as non-deities like Satan, Adam, Moses, Noah, and the pantheon of Christian saints.)