I have come to the conclusion that there is no god and I'm not sure how to tell my mom that. Does anyone have advice on how to 'come out' to her?
If you are under their roof, might be best to hold off, but if you are already on your own it is entirely up to you if you want to tell her. Are you especially close with your mom? Is she super religious, where it's part of everything she does, or is she more like most, just a person that happens to believe in god, otherwise going on with her life?
If you are on your own, and they pester you about church or whatever else, that could be an opening to explain that you don't believe anymore.