The argument from reasonable nonbelief- If the existence of gods were self-evident, everyone would believe. The burden of proof is on religion. Faith is not a virtue. Socrates' reasonable nonbelief earned him a death sentence for impiety and corrupting the youth.
Lack of empirical evidence- Discovery trumps revelation: the skeptical or naturalistic argument. Hippocrates understood that the God of the Gaps was an appeal to ignorance.
The argument from inconsistent revelations- Cosmopolitan doubt: all religions can't be right, so they are likely all wrong. Aristotle thought that religion was the personification of astronomical features and was used to promote social cohesion.