(click to enlarge)
From left to right;
Backrow; Yellowjacket (Henry Pym was also Goliath and Ant-man, but definitely is coolest as YJ), Starman, Dreadstar, Booster Gold, The Atheist (go figure)
Front row: Quasar, Blackhawk, Mastodon, Vivisector (in front of Mastodon - also worth noting that Vivisector is openly gay), Mr Terrific, The Savage Dragon, and the Nazarite (who I believe is from a religious comic).
This link (as well as the header) takes you to a table of the different superheroes and their associated religious affiliation.
The picture above was from a site called 'Omni Brain' and omits;
Agnostics (who are still technically atheists); Green Arrow, Y the Last Man, Slaying Mantis, Amok, Kyle XY
Secular humanist; Reed Richards
Communist Atheists (which is a curious designation as 'Communist' isn't a religion); Red Star, Vanguard, Crimson Dynamo, Doctore Volkh, Mikula, Ursa Major, The Collective Man, Colossus
and 'techno-futurist' Iron Man
But most interesting of all, is (my personal favourite) Wolverine;
His designation is 'raised protestant, has practiced Buddhism, sometimes atheist, sceptical seeker' which is something that about covers my perspective too (though my flirtation with Buddhism was for all of 10minutes, and there is nothing 'sometimes' about my atheism).