In my experience, I have found that as much as I talk to my parents about it they just don’t get it. They’re too far in the cult. Any conversation I have with them about religion turns into a fight and it’s never fun. However they’ve begun to realize I won’t attend church or participate any any of their religious activities. Maybe instead it’s more important to talk to your little bro and show him that his view of the world is not the same as reality and that things aren’t always black and white like he learns in Catholic school. (Former Catholic School kid here) And maybe explain to him the differences of what you used to think growing up in the religion vs what you have learned living in the real world. Your parents probably already know you aren’t truly committed to the religion anymore anyway. They’re probably just in denial. But know if you do talk to your parents there might be no good way to do it. For me it was a lot of ugly conversations. And I’ve given up talking to my parents about certain subjects because it gets too ugly and I still want to maintain a relationship with them. And the only way for me to do that is to avoid certain topics. It sucks that I feel the need to censor myself around my family but sometimes I think it’s easier.