Where do atheists get their morality from?

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I think most of the people here have argued that morality is subjective and has its origins with individual thinking and evolutionary predispositions. This isn't the result I expected with my OP. I believed most atheists felt that there are overriding moral principles that could be called objective.

I have trouble even writing this first question in a coherent way because the term "better" calls for a subjective judgement, but here it is. If morality is subjective how can one person's view or one group's views be better than another?

If our morality is in a large part defined by evolution, how can we trust ourselves to make a subjective moral judgement. Isn't moral judgement then just the reflexive neural response of an electromechanical ape-like meat machine?

How can anyone claim the right to pass judgement on anyone else, since all morality would seem to have an equal footing?

This should be good to get some friendly discussions going.