No major medical, psychological, or scientific organization supports the claim that "homosexual temptations" are destructive, abnormal, or even changeable. In fact, there is much evidence indicating homosexuality is normal, unchangeable, and destructive only to the same extent an individual is ostracized and discriminated against for it.
So, without evidence backing your claim despite plenty of evidence backing its contrary, your church is being intolerant when it tells someone his sexual orientation is something that requires "overcoming". It does not matter if he came to you of his own volition. If he came to you wanting to kill himself, is it automatically acceptable to help him do that since he chose to come to you and ask for it?
Furthermore, tolerance, like respect, is a two way street. In other words, you must give it to deserve it. I am tolerant of your religion even though I don't agree with it, but only to the extent that you are tolerant of me. Beyond that point, intolerance is self-defense and acceptable (but only to the amount necessary to counteract yours). You still have every right to believe that homosexual behavior is immoral, and I'll fight for you to have that right till the day I die even though I am a gay man.
However, in order to have the right to push that belief on others, you must provide evidence showing its truthfulness and firm grounding in reality. This is especially true when there is evidence not only countering that belief, but also evidence showing that pushing it onto others is destructive and harmful to those individuals.
You have failed to provide this evidence.
