I need some help? I keep hearing things, and my parents won't help me?

Well first of all, I am sixteen. And for the past couple of months everytime I try to sleep or concentrate (mostly when I try to sleep) I hear voices.... sometimes physically but most of the time it's in my head like I am thinking it but I KNOW I am not controlling it or anything. It kinda freaks me out at times.... and I remember posting something about it and I decided to let my dad know to see what he thinks.... then he and I get into a fight because he brings religion into it (he's christian and he knows I am not which annoys the hell out of him). He thinks I'm hearing things because I'm a "devil worshipper" (which I am not by the way lol). So he starts yelling at me because I told him to save his beliefs for himself and to not bring religion into this. It's turning into a pretty bad fight... what should I do?