The difference between ethical atheism and nihlism is that ethical atheists have more faith

[jstrodel]

Please explain to me how naturalistic evolution can be teleological.

The mistake here would be thinking that if anything is teleological then there must be an intelligence behind it. Simply put, it'd be a matter of the angle you are looking at it from. For example, if you see a tree as a system then everything in it does perform a specific function towards specific goals. In that sense, there is a specific purpose behind each sub-system. But to assume that this implies a specific intelligence within each system or even a central intelligence would be incorrect.

How do you define a tree as being a separate system from the many other physical systems involved in the life of a tree. You could appeal to a biology book, but this is just an argument from authority. What actually grounds the unity of a tree as being separate from light and water and the ground?

You are probably going to define that a tree is a complex biological organism, but how do you infer teleology from this? You appreciation of the goal of a tree is a cultural construction, from things that you know about. The tree is no more a goal than the mass of molecules that results from a dead seed and the water that produces nothing.

All of your metaphysics traces back to phenomenological categories. You are just making them up. There is no reason to suppose that there is any design to anything if naturalism exists. Trees are no more designed than failed evolutionary experiments and no more designed than broken up rocks or water molecules.

It is not the angle that you look at it. People are not free to interpret human nature for instance as ending in sexuality and define sexuality to be the prime reason that people exist, the goal of human life and therefore declare that rape is ok. There are moral absolutes and there are teleological absolutes, and the two go together. A human being is a human being, it has a definite unity that is more real than than simply saying that a human being is a scientific model that can be understood any way and the goal of human life thought to have any character, even if there is an element of truth to the biological organization.