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In fact, I'd be willing to bet that many of those condemning her here have sinned, even sexually (like fornication or adultery).

I share your suspicion.

Actually, it is God's Word that condemns the practice of homosexuality and calls them to repent as all sinners are called to repent.

Romans 1

18For the wrath of God is revealed from heaven against all ungodliness and unrighteousness of men, who suppress the truth in unrighteousness, 19because what may be known of God is manifest in them, for God has shown it to them. 20For since the creation of the world His invisible attributes are clearly seen, being understood by the things that are made, even His eternal power and Godhead, so that they are without excuse, 21because, although they knew God, they did not glorify Him as God, nor were thankful, but became futile in their thoughts, and their foolish hearts were darkened. 22Professing to be wise, they became fools, 23and changed the glory of the incorruptible God into an image made like corruptible man--and birds and four-footed animals and creeping things.
24Therefore God also gave them up to uncleanness, in the lusts of their hearts, to dishonor their bodies among themselves, 25who exchanged the truth of God for the lie, and worshiped and served the creature rather than the Creator, who is blessed forever. Amen.

26For this reason God gave them up to vile passions. For even their women exchanged the natural use for what is against nature. 27Likewise also the men, leaving the natural use of the woman, burned in their lust for one another, men with men committing what is shameful, and receiving in themselves the penalty of their error which was due.

28And even as they did not like to retain God in their knowledge, God gave them over to a debased mind, to do those things which are not fitting; 29being filled with all unrighteousness, sexual immorality,[c] wickedness, covetousness, maliciousness; full of envy, murder, strife, deceit, evil-mindedness; they are whisperers, 30backbiters, haters of God, violent, proud, boasters, inventors of evil things, disobedient to parents, 31undiscerning, untrustworthy, unloving, unforgiving,[d] unmerciful; 32who, knowing the righteous judgment of God, that those who practice such things are deserving of death, not only do the same but also approve of those who practice them.