What I see happening in this thread. Basically, I see the question is, whether we can best trust a person whose notions of what is ethical is primarily informed by a belief in a higher power, in this case the Christian God of the Bible, or an inward sense of ethics such as empathy as suggested by secular thinkers.
Look at one difference. The Christian God is eternal and represents the one and only truth. It is a faith that inspires a great deal of ethical certainty. If your morality is God's morality, you can hardly go wrong.
Alternatively, if you believe you have the one true morality and are completely insane at the same time, you can act as a monster with little in the way of inhibition.
That's less of an issue for the secular moralist who practices situational ethics bases on supposedly rational analysis. There is no final truth to anything, but judgment to be made as to the best the rational mind can come up with.
As a side note, if there is a God then the secularist will tend toward God's law even if he or she does not know that God exists, because, (I would suggest) both the Christian God to Christians and God generally speaking, probably is considered to be rational if He actually does exist.
But what if what the rational secularist goes by isn't really rational at all, but some similar form of insanity as potentially expressed by some similarly deranged Christian?
Owing to the fact that either the Christian notion of God as filtered by the contemporary Christian mind and the current level of Christian spiritual evolution or the contemporary situational ethics of the contemporary secular ethicist influenced by the same background cultural stage of evolution are both, I would suggest, capable of reaching the same level of advanced understanding or depravity equally, it would seem to me that neither can offer anything to suggest we can trust them.
Without an ethical absolute truth behind ones ethics, ones ethics can perhaps be more easily broken, with one that is insane, the greater fanaticism implied by its absoluteness becomes a dangerous liability.
In every instance where paradox appears in my experience, an answer that resolves the contradictions appears at a higher level of understanding. For me this issue resolves in the realization that we were created in the image of God and therefore create God in our image. The eye with which he sees us is the same eye with which we see Him.
The answers are to be had in self awareness. Self awareness to me is the capacity to feel what is to be truly human. That is not a state that is possible where there is unconscious motivation, having feelings one will not allow into conscious experience. To know thyself is wo reawaken to ones ancient programming pain, to retrieve the life that happened before our psychic deaths. How that can be done is the question that interests me, or is it the question I will not face?