Right, thank you, atheism is based on the lack of evidence.
1) The atheist applies their human reason to the question.
2) By doing so they are assuming human reason is binding on the question.
Are we? That is some pretty fancy wording for "being rational". But atheism does not even need any rational justification at all, either. It is just an absence.
3) Where is the proof that this is true?
There is no need for any proof, but in certain circunstances it can be produced, usually in the form of the argument from evil or of contradictions in the alleged deities.
Please consider what human reason actually is, and what the God claim actually is.
Human reason is the poorly developed ability of a single semi-suicidal species on a single planet in one of billions of galaxies. A species only recently living in caves, a species with thousands of hair trigger nukes aimed down it's own throat, a well known ever pending existential extinction threat it rarely finds interesting enough to discuss.
And with a very self-evident knack for inventing fictional beings, a point that is very relevant for this discussion. As is the equally obvious knack for unhealthy beliefs and emotional attachments.
The God claim is a proposal about the ultimate nature of all reality.
Not always, as it turns out. The idea that a God
must be connected to some attempt at explanation for everything that is is far from universal.
Also, calling it a "proposal" is quite a bit generous, being the non-answer that it actually is. There are probably languages out there where "deity" and "mystery" share the same word. We should consider reintroducing one such word and adopting it for religious practice, come to think of it. It would be healthy, regenerative.
So, this one little half insane species on one tiny planet in one of billions of galaxies thinks the rule system it has developed is binding on everything everywhere (a realm it can't even define in the most basic manner) and thus upon any gods who may or may not reside within.
That is a very good argument for doubting any claims about a creator god, you realize. Particularly those considered creators of existence itself.
Now it could possibly be true that human reason is binding everywhere. Just as the Bible could possibly be true.
Just about the same odds, I agree. Except that I don't think I have ever learned of anyone who thinks of human reason as "binding" in a supernatural sense. That would be odd.
Reason is pragmatically necessary and far more reliable than the alternative. It is not a supernatural belief, though.
But there is no compelling evidence to prove either.
Thus the entire debate is faith based on all sides.
You must have misunderstood what reason is and what it means, to say such a thing.
And finally...
Theists generally get this.
Atheists generally don't.
Because it is wrong.