Can I try to force a gay guy to not like me?
Do you not like them because of your religion? It's sounds like a reasonable request.
I'm a deeply religious person. I consider homosexuality a deep wrong in itself and a sin before god. But I realize that this is a different topic.
I'm sorry his feelings are against your religion, but you need to be respectful of him as he may be respectful of your religion. You don't need to be very pushy and borderline bully him, you will keep making Christianity look bad by trying to change him.
I'm going to try to convert him anyway and I'm doing this for his own good.
You are a believer so you shouldn't be a preacher because you are not a priest and it comes off as a bit annoying when people try to convert others. Why don't you just tell him you're not gay and that will be the end of it? I don't think he can change who he is.