again, like skepticism, no one can (nor should) live a life of moral relativism, where "what's right for you is right for you, and what's right for me is right for me..." Case in point: Nazi GErmany... can we really say thay Hitler's view of morality is equal to that of Jesus? Of course not? Why? Because even though we are all depraved b/c of our sinful natures, we still have the limited ability to discern b/w right and wrong. I'm certainly not saying our own consciences are infallible (again the sin problem, our moral compasses are broken), but there are times when we can recognize and discern b/w right and wrong correctly.
Also, using the transcendental argument for the existence of God here. Even those who would argue that God is not the standard of morality, but we as humans determine it (which is scary given our propensity to sin), without the existence of God as a properly basic belief, without presupposing his existence in the first place, all talk about morality would be meaningless gibberish...
but again, i'm not speaking out of arrogance, i'm simply trying to give a defense of my faith and the hope that is in me.