A Levite and his concubine

[Esquilax]

There has to be a person somewhere. I am tired of being asked to present my authority on things that come naturally to any decent human being, without getting some real answer in return.

That's all well and good, and I agree with you that if he absolutely had to, Lek could come up with some reasons why X, Y, and Z acts are immoral that aren't just "god told me so," but we do need to keep in mind that to a christian, "god told me so" is sufficient justification. The reason we end up getting so many bible quotes and so on is that it's an authority they have opted to accept, and because of this, that authority is plenty reason on its own.

The trick is to crack open why that authority is what it is, and what reasons underlie their acceptance of it. Because there's not much there.