Captain Atheist is a member of The Avengers. He is commonly known as the worst Avenger that has joined. Since Captain Atheist is an atheist, he refuses to help anybody who says 'Oh, my God' or 'Jesus Christ' because he does not believe in them.
Captain Atheist is the Worst Avenger
Christian Guy thanked Captain Atheist (but said 'Thank God'), but he says that he doesn't think so (meaning he doesn't think god exist). Christian Guy then asks Captain Atheist if he will help him or not, ending with "Jesus Christ" but Captain Atheist says: "Am I gonna help ya who?". Christian Guy then dies because some rubble fall onto him. Captain Atheist then says: "Oh shit".