AGC said:
Perhaps a better start is, what is sin? That's what all your questions seem to me to revolve around. I will yield the floor for you to explain your idea of it and then be happy to engage.
I have a few fall-back definitions. The first is the literal meaning of "missing the mark." So basically being or doing anything besides what God would want us to be or do. Under this definition marriage would be a sin, though, because God's ideal plan for us is celibacy.
Next is sin as transgression of the Law. This is quite literally "the Bible say so", either in the Mosaic Law or later clarifications. But you don't need to read more than 1 or 2 rabbinic opinions to realize there's a lot of room for interpretation here. Under this definition marriage and divorce are both not sinful, but any homosexual activity would be under most interpretations.
Then you have the "knowing the good you must do and not doing it", which doesn't seem to apply unless we're coming back around the the chaste ideal.
Finally, there the idea that we are to selflessly love God and one another, and anything that contradicts that is sinful. So basically selfish behavior is sinful. In this case any relationship could be sinful if it is pursued or continued selfishly. OTOH, a selfless relationship would not be sinful regardless of hetero/homo, to the extent such a relationship can actually exist.
Lastly, I struggle a bit with the idea of worship and sin changing over time. Take animal sacrifice. At one point it was optional, then it was mandatory, and now it's prohibited. I've read some things that say animal sacrifice was never God's plan, but it was a common ancient practice for confirming contracts and showing devotion. So God adapted it to serve His Will but He could have done without it. When it comes to homosexuality, there are legitimate reasons in the ancient world to prohibit this. For one thing, the population of Israel had a high attrition rate, and it took the full effort of the populace to maintain it. Take 2 men or women from that equation enough and you get disaster. That concern really doesn't exist anymore.
Sorry for the long response:
TLDR- are sins all situational and based on broad principles or are they unchanging in all situations and therefore somewhat arbitrary, or are they both? And which one is homosexual practice?
Typo edit
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