This powerful article by Geoff Thomas considers the damage that can be wrought when the church advocates sin by affirming the gay lifestyle.
These "affirming" Christians are likened to: "the doctor who examines her patient and discovers life-threatening, but treatable, cancer. However, knowing that the patient cannot bear the thought of the painful treatment, she sends the man home with the good news that there is nothing wrong with him. Instead, the good doctor tells her patient that the symptoms of cancer are something quite natural that she should accept. In the same way, [The subject of the article] has had professing Christians tell him that homosexuality is natural, that he was born this way, and he should accept the way he is. They have said that his marriage was mistake; he should divorce his wife and affirm his gay identity, but he has heard countless stories of men and women who came out from affirming churches because they realized that they were not being who God wants them to be."
What will be the accountability of those who on the Last Day stand before the throne of God and must defend themselves against Paul's words in Romans 1:32...
"Although they know God's righteous decree 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."