I have always found atheism extremely irrational. Logically, no-one can disprove the existence of God.
On the other hand, agnosticism seems logical. If you have no spiritual experience, then it is reasonable to conclude that you do not know if God exists or not. Clearly, atheism has its roots in psychology, or rather pathology.
We can safely conclude that:
Atheism is a crutch for those who cannot cope with the reality of God.