Developing systems of morality, outside of religious influence.

[FatAndFaithless]

So anyways, for a TL;DR: how do each of you, personally, approach ethics?  Do you adopt a certain system, or do you use a more cobbled together way of approaching things?  How does one feel justified in applying their belief system to the world, if there’s no divine objectivity backing them up?

The same way that christians do, and the same way that former christian atheists do.  "Divine objectivity" is a bit of a misnomer anyway.  The mandate of heaven is subjective.

Yup.  Clearly illustrated by the billions of Christians that disagree with each other on what is moral. I agree that appealing to the Bible or God is the opposite of 'rock solid'.