Why do Athiests require 'proof' that God exists?

[FallentoReason]

For example one cannot prove ones own existence - I could argue that you are a figment of my imagination, like a person in a dream. You would be unable to prove that you were a self aware, autonomous human being.

The French philosopher Descartes came to the conclusion that the very fact that one can ask oneself 'do I exist' shows that one does in fact exist. Otherwise it would be an impossibility to even undergo the task of asking oneself.

Using atheist logic I should therefore consider all other humans to not be self aware, sentient, concious beings as they cannot 'prove' they have these qualities.

I'm not sure what 'atheist logic' is as you can't box them into one category of beliefs. The only thing they have in common is the lack of belief in a deity, that is all.

Either way, I think it's reasonable to be able to corrolate the actions of others with their self awareness, as I have observed with myself.

Would it not be better to accept that I can never know if other people are self aware like me? That I can never know if God exists or not?

I agree to an extent that you can't show 100% but I mean we're talking a very thin philosophical line here. In practice I observe that others have the same functionality as me and I'm aware of my existence, so therefore I'm inclined to believe they do too.

As for God, I personally believe that such a being hasn't presented itself to us. Whether it exists or not, I haven't really given it much thought lately.