I'm confused

So me and my BF have been dating for 2 years he's a Jew and I'm Muslim ( lol how ironic ) but we love eachother to death and his parents accepted me , my parents know that I'm dating someone but they don't know that he isn't Muslim . My mom told me she would rather me stick with the same religion but if I'm happy and he makes me happy she would be okay with it , I asked her how my dad would react , and he's very religious . I celebrate my holidays and what not I'm just not that religious but I do believe in my religion, .. She said she wouldn't know how he would react ( in a bad way ) like he might even throw a fit or disown me( because he's very religious )  . Even though I'm ready to fight back with him ( verbally obv) I'm so scared , and I will not break up with him and date someone just to make them happy , It's my life and my happiness so I don't care anymore .. Help :/ what should I do if he really gets angry and throws a huge fit and starts throwing shit at me ( lol he would really do that ) but welppp:/ :((( ( I'm 18) And I'm talking about if we get married , and I have to tell him obv .