Brian Griffin, Cleveland Brown, Cleveland Brown Jr. Hayley Smith, Roger Smith, Rick Sanchez, Professor Frink, Professor Hubert J. Farnsworth, Wendy Testaburger, Daria Morgendorffer, Dr. Light, King Dedede, Solid Snake, Donkey Kong and Waluigi.
Characters who MAYBE are Atheists:
LDShadowLady and Notch.
Characters who are Atheists in Kid Shows:
Squidward Tentacles, Eustace Bagge, Talking Pierre, Wile. E. Coyote, Grunkle Stan, Discord and Mr. Robinson.