An atheist friend repeated the atheist mantra " When I die I will go back to that condition that I was in before I was born: nonexistence"?

When asked how he can be certain he did not exist in any form before birth he replied "I have no memory of it, therefore it is highly improbable that I did exist". When questioned about memories he has of being 2 weeks old he admitted he had no memory of that either, though, he agrees, he must have... show more When asked how he can be certain he did not exist in any form before birth he replied "I have no memory of it, therefore it is highly improbable that I did exist". When questioned about memories he has of being 2 weeks old he admitted he had no memory of that either, though, he agrees, he must have existed at that time.
Question: Does not having a memory of something prove that it never happened?
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