Matt Dillahunty provides a devastatingly effective defense of secular morality vs. religious morality. Darrell Ray provides some great points as well.
same place everyone else does from parents and surrounding society .
And we can change them if they turn out ot be unsuitable.
True. But that's not really the question. Reading between the lines, the real question is two-fold: Absent a god, what is there to bind you to your morals. And, absent a god, how can your morals be as good as theirs.