Faith in something doesn't need presuppose faith in anything supernatural.
And theists have no empirical basis for their morality either, because faith by definition is belief in the absence of such evidence. People just believe what they believe. I prefer to be fed rather than starve, I prefer peace to suffering, I prefer liberty to slavery. I'm a social being capable of empathy and extending my beliefs about myself to include my expectations for others. I prefer others be fed, rather than starve. I prefer others have peace rather than suffer. I prefer others have liberty rather than slavery. I believe human life has value because I value my own life, and therefore value the lives of others.
What do I need to have faith in, here, other than nature and mortality?
Faith in something that is the basis for any morality absolutely does presuppose faith in something supernatural. If you know of anything in the natural world that proves the existence of right and wrong, by all means let me know.
I don't disagree that theists lack empirical basis for morality, both because I don't think anyone does and because I don't believe there is an empirical basis for God.
But it doesn't sound like you have a morality*. It sounds like you have preferences. One doesn't decide one's preferences, and even if they did, they would need a morality to do so rightly. This suggests that your being a good person is strictly luck of the draw. If my friend Bob the sadist says he loves it when people starve, would you be in the right to tell him he's wrong? On what grounds?
*Don't take this the wrong way- I don't mean to insult you, and I fully expect you do have morality. I'm only criticizing the argument here.
>If my friend Bob the sadist says he loves it when people starve, would you be in the right to tell him he's wrong? On what grounds?
You first. You don't believe there is an empirical basis for God yet you believe morality absolutely presupposes faith in the supernatural. Presumably, you also consider yourself to have morality. On what supernaturally-derived basis would you (presumably) believe Bob is wrong? and given that the supernatural cannot be objectively proven, how does that faith differ from a preference, on your part?
On the basis of utilitarian notions of right and wrong, I would have no issue with saying that Bob is objectively wrong- he disagrees with what I claim is objectively right. If all I had were preferences, I could no more claim Bob was wrong to prefer to be a murderer than I could claim he was wrong to prefer to be an art teacher. I say, 'I wouldn't do that if I were you', he replies, 'Good thing you're not!', end of discussion. And then I guess he would probably murder me. Or worse: teach me art.
Faith also beats preference here in that, given the premise that it is good to reduce suffering and increase happiness, I arrive at the same conclusions about morally correct actions regardless of the time and place that my mind happens to exist in. I can align my actions to the right choice even if I was raised to prefer something else. A slave owner prefers that slavery exists; a utilitarian slave owner can see that that is wrong and free their slaves.
And theists have no empirical basis for their morality either, because faith by definition is belief in the absence of such evidence. People just believe what they believe. I prefer to be fed rather than starve, I prefer peace to suffering, I prefer liberty to slavery. I'm a social being capable of empathy and extending my beliefs about myself to include my expectations for others. I prefer others be fed, rather than starve. I prefer others have peace rather than suffer. I prefer others have liberty rather than slavery. I believe human life has value because I value my own life, and therefore value the lives of others.
What do I need to have faith in, here, other than nature and mortality?