Help! Boyfriend/family problems

I'm 18, Me and my boyfriend have been in a long-distance relationship for 3 months. A few days ago my mom started stalking him on Facebook and as a strict Christian mom she and my step dad decided that he wasn't suited for me. I don't want to break up, but I also have never not listen to my parents. If I don't break up with him what can I tell my parents? Also I live at home so the tension is really starting to kill me. Please, I could take all the advice I can get.