There are background moral values running in parallel to the process of inquiry of any kind, but the point from an atheist perspective is that mere personal preference (for whatever reasons) is enough to equal the commitment to certain values on the part of those who believe in God. Having known a number of atheists literally in my neighborhood for decades, I think this is true. In fact, in some instances I've never seen such commitment to certain values with which we obviously agreed. So I think the no morals without God thing is off target, counterproductive, and simply unneeded anyway as an argument for God. There may be a successful moral argument for God, but nothing I've seen so far seems successful.