Fun quotables from prominent thinkers:
No God, no Master.--Margaret Sanger
Religion . . . is the opium of the people.--Marx
Religion is not merely the opium of the masses, it's the cyanide.--Tom Robbins
Religion is all bunk.--Thomas Edison
Religion can never reform mankind because religion is slavery.--Robert Ingersoll
How many evils have flowed from religion!--Lucretius
Men never do evil so completely and cheerfully as when they do it from religious conviction.--Blaise Pascal
All religions are ancient monuments to superstition, ignorance, ferocity; and modern religions are only ancient follies.--Baron D'Holbach
And an alternative idea:
Nothing to kill or die for, and no religion too.--John Lennon