One should remember that Ethics is indeed the description of good to be carried out as morality. While Christianity is most excellent, we now attribute the best Ethics to Kantianism, in my opinion, no other ethics to this quality described to this extent.
Some people, especially the Atheists, brag about how excellent they are in being both ethically minded and moral in life, yet they never want to reveal what ethics they believe in or credible solutions to existing problems in Applied Ethics that they wish to win people's hearts and minds for!
One clear case that has won people's hearts and minds is the human rights, UDHR, well within exactly the Kantianism.
So the challenge is right here. I bet you (who oppose Kantianism/Christian Ethics) can't follow!
Links:
https://en.wikipedia.org/wiki/Friedrich_Nietzsche
https://en.wikipedia.org/wiki/Beyond_Good_and_Evil
https://en.wikipedia.org/wiki/The_Antichrist_(book)
Cheers!

(I'll come back with some more to make it crystal clear, but the essential words are above and scope is thus given.)