To me, the ethics essentially come down to mirroring Christ in my own life in everything I do; the moral compass is Christ himself in the Christian life. I fail often but that's the goal / struggle. With that, I'd like to know what those outside of the faith find deplorable about the way Christ lived His life?
And I do understand that deplorable ethical decisions have been made by those or the body calling themselves Christians (and sadly, myself too at times). I would say this is a sin / shortcoming of the person or group and not of what Christ has asked that person or group to live like.
James 1:27: "Pure and undefiled religion before God the Father is this: to care for orphans and widows in their misfortune and to keep oneself unstained by the world."