[Romans 1:18-32] is actually an account of wrath and judgment. Homosexuality is a curse and a punishment. It is describes as 'unnatural' and a 'perversion'. The same people are listed along with 'evil, greed and depravity. They are full of envy, murder, strife, deceit and malice...'
I think that's enough hard matter to swallow for now. You can do a more thorough study of the chapter on your own if you like.
For a finishing touch, here's the last verse of chapter 1:
32 Although they know God's righteous decreee that those who do such things deserve death, they not only continue to do these very things but also approve of those who practice them.
Those things are deserving of death.
It is, however, possible that such can become christians. Everyone can become christians, and I'm sure we all know why. God's grace, mercy and salvation extends to all who would receive it and live in it. Once becoming christian, however, repentance and being born again comes into the picture and such things would have to be permanently discontinued.
What happens with if they are? Well, the curse resumes, and the chap who just got pulled up the cliff slips down it again. If he doesn't scramble up soon, he'd fall all the way to the bottom. Salvation is not under warranty if you deliberately mock it. That's the same as asking for forgiveness from your father and then slapping him in the face and jeering at him.