Where do atheists get their morality from?

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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?

I really think part of the problem here is how the Christian worldview seems so fixed on dichotomies that it imposes them even when the topic doesn't call for it (see the logical fallacy "false dichotomy"). I've noticed it in a lot of Christian writings.

I pondered the three questions I asked during the 25+ years I was a hard core naturalist/atheist and thought Christians were just superstitious idiots, so a Christian worldview has no bearing on the questions. These questions were troubling to me when I was an atheist. That's why I'm interested in how other atheists reconcile the questions I asked.

I'm perfectly happy with that definition. External to the mind works fine.

But God would have a "mind" and therefore any system of morality invented by God would not be objective. Objective must be external to any mind, even God's.

You're equivocating on the term "mind". My OP and the questions I posted were about atheist opinions on morality. I'm trying to keep my opinions from taking the discussion off topic.