I don't think that those opposed to homosexuality in the Christian community will admit that it is a sickness until there is a cure. Once there is a cure, then if you choose not to seek treatment, then you are back to the beginning, choosing to be homosexual.
You have to understand , we are all born "flawed" in terms of sin, no different than a genetic defect, a universal one. No one is born perfect, and we will all sin, period, like it or not. That's just the way we are made. The choice is whether you turn to God for forgiveness and strength, or whether you delight in it and indulge yourself without thought to propriety. So, you could say there is already a recognized defect, one that we all share. For some it manifests itself in terms of homosexuality, others have different pet sins.
The condemnation isn't of the act of homosexuality, it is of the legitimization of the act, the denial that it is sin, the refusal to repent. What you do personally is between you and God. What you legitimize and promote is of great concern to the community as a whole. People will always sin, no one should ever condemn you for those sins. When people justify sins, act as if they are proud of them, and refuse to accept the wrongness of them, then they stand in defiance of God and you get the attitude that many Christians have versus homosexuality.
