Imagine that you could listen to or talk face-to-face with satan about any subject that has to do with God.
Then bring to remembrance anything you've heard atheists say against God. (Or if you are an atheist, you know your own sentiments and thoughts).
Now, if you try, you will find that it is impossible to imagine satan expressing sentiments about God different than what atheists express. Satan certainly is not going to speak positively about God, and neither are atheists. So, what both think and verbalize is in complete harmony with one another.
Atheism is therefore a doctrine of demons, and in many, if not all cases, atheists are demon-possessed.
So it is quite possible that when you read the writings of atheists, or heard them speaking, all you heard was demons ranting against God.