People are all different. This is something that more conservative people should learn to accept. It is not possible to shove down your beliefs on someone else just because you believe in what you are trying to say. Some people think that by providing some teachings, they can inspire other people to change.
It will be hard to change someone’s sexuality especially if the person already understands what he/she wants. It is still possible to be friends with someone who has a different sexuality from you. There is nothing wrong with knowing someone who has a different perspective on what sexuality is. Some experts say that the way that our brain is wired may also make some changes.