you forgot "some right and some wrong", but it wouldn't matter, since some of those address different things entirely.

they aren't religions.

atheism is neither "right" nor "wrong", it is the statement "I don't believe that" to the proposition "there is a god". if the person actually doesn't believe it, then they are right, they don't believe it.

agnosticism is the statement "I can't know that" to the same proposition. If they can't know that, then they are also right.

humanism is a philosophy of behavior, and "right" and "wrong" would only apply to it in context of desired outcome.

freethinkers are right. every man should evaluate their knowledge and experience in determining which path to follow, anything else is indoctrination.

skeptics take the view that any proposition should have the default view of "withhold belief until evidence is presented", with the added "extraordinary claims are suspect until extraordinary evidence is presented". they are neither "right" nor "wrong", it is a way of looking at the world that is useful in many scenarios.

I reckon they're alright.

Some are a bit wierd, but hey, that's life.

There might be some confusion among this group.

That's not a very coherent question. Maybe you could be a little clearer?

After all, these all overlap tremendously; in fact -- atheist, freethinker and skeptic are, effectively, synonyms. Atheists are atheists as a side effect of being freethinkers and skeptics. Most atheists are humanists or broadly agree with humanists. Most atheists are also agnostics.

I suspect you do not understand the terms you're asking about.