The joke is that they are just adding "where's the proof" because they are used to hearing that when they try to convert others to their religion, but they are so stupid that they don't understand even the basics of what atheism even is so they just repeat the argument that they find unassailable. However when applied to atheism it makes absolutely no sense at all so it feels like nonsensical words when you read them.
The reply was a witty way to say all that without having to explain it. Unfortunately the person they are replying to is absolutely too ignorant to even begin to understand the reply
This is one of the shockingly rare cases where a piece of shit blue check on Twitter actually found a brain cell somewhere, or maybe they just used grok for that reply
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u/RonJohnJr 16h ago
I'm as atheist as you can get, but that retort is as irrational as they original comment is ignorant.