Evidence for God

You just gave a philosophical reply to a scientific question.

It's not really a scientific question. "Why" is not a scientific question when it isn't used in the sense of "what is the cause of?" as in "why did the glass break when it hit the floor?" It's being used as a philosophical "Why do we exist as opposed to not exist?" or "why do we have consciousness as opposed to not?"

And anyways, the question doesn't show agnostic/atheist vs theist (which also is incorrect and a pet peeve of mine regarding the definition of atheist and agnostic, but I'll let it go), it's just a thought exercise. Saying "because there just is; otherwise we wouldn't be here" is just as good an answer as "because of God" or "because of FSM" and shows no great understanding of theism/atheism.

I have seen it so many times: Atheists/Agnostics trying to paint the creationism worldview and it's proponents as uneducated or trite--resorting to personal attacks instead of just following the evidence wherever it leads. Hopefully a reasonable and sincere person can see through what they're doing. But it's fine if you can't answer the question. It only proves my point.
I guarantee you as many times as you have seen Atheists being rude or condescending I have seen at least ten to twenty times as many Theists doing so.