I have never understood ‘what part of Romans Chapter 1 vs 18-32’ they don’t understand.
When Paul says they have refused to acknowledge God, and therefore God has given them up to their own wicked desires, he is speaking to those who violate their sexual orientation, those that go against their natural desire. But a homosexual's natural desire is for the same sex. Therefore this verse doesn't speak of them. In fact, if you encourage a 'constitutional homosexual' to become heterosexual you are violating this passage.
[ They "exchanged the natural function for that which is unnatural" (v26)]
Therefore, the wrath of God rightly falls on them (v18), they are worthy of death (v32), they are without excuse (v20).
Therefore never try to change somebody's inbuilt sexual orientation.
Here are the specific words Paul uses to describe this sin of going against one's real sexual orientation:
An impurity and dishonoring to the body (v24)
A degrading passion that's unnatural (v29)
An indecent act and an error (v27)
Not proper and the product of a depraved mind (v28)
Heterosexual people often take up a "situational homosexuality" especially in a sexually segregated environment: girls' school, boys' school, prison, boot camp. Paul wold say that's wrong, because they're turning against their nature. According to Paul, behavior going against your nature is evidence of active, persistent rebellion against God.
. God's conclusion: there's "no excuse" for going against your own natural orientation.(2 verses). 1:26-27 "For this reason God gave them over to degrading passions; for their women exchanged the natural function for that which is unnatural, and in the same way also the men abandoned the natural function of the woman and burned in their desire toward one another..."
This involves two things: turning against your own innate sexual orientation, and/or acting on the basis of sinful lust. Neither of these is applicable to a person who never turned away from their natural function; nor did they act on the basis of degrading passion or lust. It does not apply to someone who IS acting on the basis of a grateful, trusting acceptance of their own nature, motivated by sincere love and commitment, i.e. gay marriage.
Mind you,this is not my argument. This is one you could pick up at any "Gay Christian" site, which is worth a google if you're interested.
My own view is below (tagline)