There is No Such Thing as a Homosexual Catholic Priest

[Melkite]

Can a Catholic think that Homosexuality is the result of a Brain disorder? I don't mean psychological disorder, I mean brain, a biological defect. As long as you don't justify the behaviour which must nevertheless be resisted if they want to save themselves.

I think that's a slippery slope.  If it's a brain disorder, something because of a physical malady, then it would reduce the culpability, to the point that it probably couldn't be a mortal sin for anyone with the brain disorder.  Then the Bible would be wrong for saying homosexuals can't go to heaven, because you don't go to hell for venial sins.