What should I do?

I just feel like I cannot stay quite about this. This is a cultist religion that is harming millions everyday and I HAVE to be quiet, because I am a minor, in an muslim family, in a muslim country. I sometimes challenge Islam with my teachers in such a way that makes it look like a curious question that is coming from listening to outsiders and not a doubt of the actual religion coming from me, but I've started doing it with my mom, and the more I do it the less I can conceal it. I have crossed into very dangerous territory. I don't know what it is about me, but I've always been like this. Sometimes, I just cannot stay quite. It is always more beneficial for me to stay quiet. The people that want me quiet cannot be reasoned with and it's not worth wasting breath over. Like my abusive dad, when he says something ridiculous, usually I stay quiet but sometimes I just can't. I just got into a kind of heated arguement with my mom about Islam, reason to doubt it and stuff. I tried to conceal it like I said earlier but it half-slipped and looked more like me heavily doubting than me asking curiously. I am afraid if this slips I will be beyond fucked, beyond saving. I'm just 14, I'm under so much stress all the time I've started having regular often chest pain/discomfort from the stress of things, and being obese therefor not giving my heart an easy job, and my dad and his dad both having hypertension, like the actual disease thingy, really doesn't help.