Why "mysterious ways" don't matter.

[Angrboda]

We perceive that the earth is flat, but we know that perception is an illusion. Perception alone is seldom truly reliable.

I don't believe in objective morality, but neither am I a moral relativist. Biology and culture conspire to create moral sensations which, because they are intuitive, can't be easily reasoned about. That's why they appear objective.

Is there one "master list" of acceptable values?

No.

What about biology can create an intuitive moral code?

Primarily a common brain and neurology, but the whole body contributes.

Which culture conspired to create moral sensations?

I said biology and culture conspire. Asking me how one or the other does it alone is straw manning my position. Culture modifies our biological reactions.