How can I stay strong in my faith when none of my friends respect my new Christian beliefs?

If they're your friends then they will accept you. I have lots of friends that are religious and while I think that they're nuts, I love them so I don't say anything bad about their religion. If they were your friends for a long time it might be weird to see you change so give them some time and don't bring up religion in front of them and maybe they'll stop.