Advice please!

So my absolute best friend and I are (obviously) very close. We have been able to tell each other anything and everything, love each other to death, and consider each other families our own. Back at the old school we shared (I recently moved) we had a lot of gay or bi friends. I never truly supported them because it went against my religion and they all understood that, especially my best friend. Recently however, my BFF came out to me that she was bi. I’m still kind of in shock, because I don’t want this to come between us, but I don’t feel like I can truly support her and be as close to her as before. I just don’t know what to do and have no one to talk to. Help needed.