Hold on here!

We're debating your Rule of Conscience that serves as a basis for morality WITHOUT God and your defence immediately appeals to Biblical claim? Naughty naughty.
To badly paraphrase Jerry Maguire, "You had me at yes killing cats for me is righteous".
I'm sorry brother but it seems that you've made a shiny little bull idol out of your Rule of Conscience - any proposed exception of the rule is obviously ludicrous? Isn't philosophical debate precisely all about testing claims against exceptions? You're just decreeing that any exceptions to your model are false?
a) again, a biblical appeal in a debate about not needing biblical appeals?
b) It's a bad day for cats and now for ethnic populations in the Glorious Fatherland it seems. Both get greenlit because of my subjective morality.
Human justice systems are certainly informed by the Christian faith, more or less universally. And the few that aren't, or that have justice value systems greatly different than ours we would generally consider repellent. But maybe you mean that they are "without God" in their apparent secular/universal-rights current manifestation. I at least wouldn't disagree that that's how they might view themselves, but to me they're not fooling anybody
Sorry, you can't just claim you've given the correct answer and it is magically so. If you're defending that there is a standard of morality outside of God yet still adhere to terms like "good" then how does man determine good?
The plot thickens. Now there's a "perfectly informed conscience" that's reliant on your Rule of Conscience to define righteousness. If this works for you then more power to you brother
Then it must be true.