Where did God come from?

I am seriously astounded by the stupidity I have to face every single day of my life.  Just this past week, someone told me they did not believe in science.  What DO they believe in, you ask?  God.  Everything was created by God.  Everything happens because of God.  And atoms aren’t real either.  They are just something some scientist made up.

Maybe I am confused or my understanding is wrong, but was the “word of God” not written by MAN?  Are scientists not humans?

And my questions, which lead to this unfortunate discovery of ignorance:  Where did God come from?  No one can seem to answer that for me.