I have a similar situation only it is my husband – not my mom.
Before me, he’s an atheist who believed that any religion was bad. Since I’ve told him what my beliefs were, I come out continually.
Every day, it seems that I have to remind my husband about my religion!
I want to say that you should sit down with your mom and tell her about your religion, but I also want to say that living your life openly and honestly is the best way to come out to her too.