God is about spirituality, Satan about religion.
Atheism is a revolt against religion and when not induced with spirituality it comes down to sex, food and shelter or generally speaking survival which is not possible in this realm in the long run, which makes atheism hopeless. Both God and Satan, respectively, through spiritual enlightenment or religious beliefs promise a way out of this predicament into different realm and while both promises might be true…only religion is used as a way to manage and control humans while they are living as biological entities turning them conveniently into slaves.
last stop before reason for everything