- A state that is not compelled by divine law, can only make judgments based upon pragmatic and utilitarian values.
This premise requires justification. To the contrary, I claim that all legislation is the codification of morality. The only question is: whose morality?
- While it is true that in the eyes of Christianity homosexual behavior does not fulfill the moral virtue of a human being teleologically speaking, it is not evident on pragmatic or utilitarian grounds that gay marriage or the adoption of children by gay couples is immoral. The state cannot recognize moral values that transcend pragmatic or utilitarian considerations.
This depends on the truth of 1, which has been contested. But, even if 1 is accepted, it is not clear that there are no “pragmatic or utilitarian” arguments against gay marriage or adoption .
- Given premise 1 and 2, Moral rights is not the same thing as Legal rights.
It is not clear that premise 3 follows from premise 1 and 2. As a counterexample, imagine a society entirely ignorant of moral law (unrealistic perhaps but that’s irrelevant to this construction). It is possible that they could construct a legal code identical to the (unknown) moral code. In that case, moral rights and legal rights are equivalent, even though the authors of the legal rights did not design them with that intent.
- Therefore the state is legally justified in supporting gay marriage and the adoption of children by gay couples because…
I don’t believe the “therefore.” Suppose that I agree with 1 and 2. Then I’m barred from making laws based solely on moral law; if I enact a law, then it must be based on “pragmatic” or “utilitarian” considerations only. There might be such considerations that would justify the banning of gay marriage or adoption.
- Any possible moral errors in respect of divinity are beyond the knowledge of the state, and thus the state is invincibly ignorant to any divine testimony or authority.
I might agree with this if I knew what it meant. One point, though, an abstraction (like the “state”) does not possess knowledge: you’re fallaciously personifying an abstract object. You might, however, argue that the knowledge of the state is the union of the people that comprise the state. I’m not sure that I agree with that either. You’ll have to convince me of it.
- Thus a state is necessarily pluralistic since it cannot oppose anything on the basis of religion or belief.
I don’t believe the “thus”: it’s not clear that it follows from the previous premises. I don’t even accept it as a premise: it is possible (however unlikely) that the people who comprise the state agree on every issue. You have to rule out that possibility and I don’t think that as a matter of logic only (that is, without appeal to considerations external to logic) you can do this.
Conclusion: Therefore if you support the split between church and state, you have to support gay rights despite any moral beliefs to the contrary.
I don’t believe the “therefore.” Even if I accept premises 1 through 6, I don’t see that the conclusion follows from the premises. It’s not a sound argument; worse still, it’s not even valid. Let’s suppose, however, that the conclusion is true. All you’ve proven is a conditional statement. You haven’t proven that “you have to support gay rights despite any moral beliefs to the contrary” but only that this must follow if “you support the split between church and state.”
I don’t intend to be snarky, but since your argument is rife with elementary errors you should consider taking a course in logic or studying a good textbook on logic. I’m glad to recommend books if you’re interested.