They are probably referencing I Cor 6:9-11 - "Do you not know that the wicked will not inherit the kingdom of God? Do not be deceived: Neither the sexually immoral nor idolaters nor adulterers nor male prostitutes nor homosexual offenders nor thieves nor the greedy nor drunkards nor slanderers nor swindlers will inherit the kingdom of God. And that is what some of you were. But you were washed, you were sanctified, you were justified in the name of the Lord Jesus Christ and by the Spirit of our God."
And that's the part they seem to be ignoring. As another poster put it ... sinners are always welcome, but the sin is not.
Possible, but that is rather generic, don’t you think? And the tense is past. “Were” is the relevant verb.
No, the way I read it, because these gays aren’t actually looking to repent and cease practicing their vice, is that they are referring to an active gay man.
I once heard a theory that St. Paul was gay. However, as he wrote the passage you gave, it seems unlikely to me. And, if so, what would it matter? Paul was a sinner, same as the rest of us. And obviously, he had repented.