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?
You haven't provided enough information. A lot would depend upon what your relationship with your mom is like. How "devout" a believer is she? How old are you? You mentioned waiting until being financially independent in your poll, do you think she'd throw you out, or stop helping to support you? You need to give more information before anyone can really give you any kind of advice.