Atheism in a nutshell
As atheists, we don't claim to know where the whole of the universe came from. We are humble enough to say "We're not very sure but for now, evidence points to the big bang. We might be proven wrong in the future."
But you claim to know everything from start to end. And you say you can never be wrong about your supernatural beliefs because you base your beliefs on an ancient book.
Now, who's really the arrogant one?