Wow, cool facts. The person you are disputing has a good point. Straight people can get AIDS as well. It's not a homosexual-only disease. HIV began with possibly a homosexual and it spread through the "gay community". It doesn't mean all homosexuals will eventually get AIDS.
So what if it's a sin in your religion? Nobody has to follow your religion if they don't want to. What if every homosexual out there made a book like the Bible, made their own religion, and said that all heterosexuality was a sin? Nobody would care.
Why would anyone change from being heterosexual to homosexual? Who would want that? Who who want the morons who bully them for being homosexual? Who would want to deal with the emotional stress it takes to be homosexual? Honestly think a little harder before you choose a side.