Why do Athiests require 'proof' that God exists?

[JesusLover]

For example one cannot prove ones own existence

"I think therefore I am" - Rene Descartes, 1637

What I meant was you can't prove your existence to others.

Absence of evidence is not evidence of absence therefore you cannot prove that the tooth fairy does not exist.

Yes, the tooth fairy could exist somewhere in the universe or in a different dimension. However I'm not trying to disprove the existence of the tooth fairy due to an absence of evidence, I only know I have never seen a little woman with wings.

Atheists are trying to disprove the existence of God due to an absence of evidence, despite the fact that he exists in all things at all times, inside and outside of the universe. He is incomprehensible.