RR,
Some people accept only scientific evidence as bearing on "truth". For those people, I believe you are right. Since science only produces explanations that are natural, and since "natural" is simply a word we've made to include both materialism and determanism, then those who accept scienctific evidence and theory as "true" (or only scientific explanations as "true") will follow the path you've outlined.
That's just due to the nature of the concepts. Science only deals with material, deterministic explanations.
The idea here is to study what evolution necessarily includes.
You can study evolution without believing science is the avenue, or the only avenue, to truth.
I've identified several corollary concepts. If you accept TOE, you must also accept the following:
I hope my previous replies helped explain why I think this is an overstatement. It's only if you accept science as the only thing telling you about truth.
By the way,
1. materialism
2. determinism
Even if you accept these as true, "free will" can still be a useful construct for understanding behavior. Pretty much, we have no other manner of analysis, so ... at this point, it's a necessary construct.
3. atheism
Again, I hope my explanation above makes it clear that I think atheism would be forced by the belief that only science can tell you about truth.
Assuming that "god" need be supernatural. Natural "gods"; i.e. the worship worship of natural things can exist, but I don't think you're interested in that.
4. and lastly, of course, nihilism.
This doesn't make sense to me. Nihilism is a subjective opinion. Meaning is imposed by the individual. The meaning imposed can be perfectly objective.
They just have no reasonable grounds to back them up.
Another way to approximate that thought is to say, there is no objective meaning, but there's nothing to stop an individual from believing in an objective meaning. But really, since meaning IS CREATED by the individual, an individual who believes in an objective meaning CREATES an objective meaning. There's no reasonable grounds to back it up and no reasonable grounds to shoot it down. It's a construct that depends on the individual.
Nihilism is not necessary. Because meaning has nothing to do with naturalism or logic. Nihilist are nihilists because they chose. "Choose" not meaning necessarily a conscious choice, but "chose" in the embodied sense--you, as a mind and body, as a being, chose it. You did it. Your body is just responsible for you as your mind.
Feel free to ignore me. I'm having trouble getting people to understand where I'm coming from.