Atheists... why do you believe that God doesn't exist?

[Coffee Jesus]

Are you suggesting that all forms of knowledge fall within the purview of natural science?

So you plan to prove your god's existence without making any references to empirically observable reality?

Or are you here to say you have witnessed proof that we cannot see for ourselves?

Are you aware that the philosopher of science that promoted the criteria of falsifiability, Popper, believed in God?

Okay... Nothing I said above entails disbelief in God. It just explains how someone can be an atheist about a claim they haven't yet refuted.

But is it really true? Karl Popper, a theist?

Wikipedia - Karl Popper
"In an interview that Popper gave in 1969 with the condition that it shall be kept secret until after his death, he summarized his position on God as follows: 'I don't know whether God exists or not. ... Some forms of atheism are arrogant and ignorant and should be rejected, but agnosticism—to admit that we don't know and to search—is all right.'"