It's all very well to tell me that I should stop arguing over definitions

You are arguing over definitions but it is useful. You make many posts that rely on these concepts so the definitions are relevant. That 'you are just arguing semantics' call is sometimes an irritating cached response.

but I seem to be at a loss to make people understand what I am trying to say here. You are, of course, welcome to tell me that this is my fault; but

You are making more than one claim here. The different-concept-alien stuff you have explained quite clearly (eg. from the first semicolon onwards in the parent). This seems to be obviously true. The part before the semicolon is a different concept (probably two). Your posts have not given me the impression that you consider the true<islam> issue distinct from normative issue and subjectivity. You also included 'objective morality' in with 'True', 'transcendental' and 'ultimate' as things that have no meaning. I believe you are confused and that your choice of definition for 'should' contributes to this.

it is somewhat disconcerting to find everyone saying that they agree with me

I say I disagree with a significant part of your position, although not the most important part.

, while continuing to disagree with each other.

I definitely disagree with Tim. I may agree with some of the others.