Question for Atheist?

Hi. So i'm only 14 and I told my mom I was an atheist and made my life really bad. She doesn't want me to use the computer because I'm learning more than her. Everyday she fights with me on how god exists and how she must have failed me as a parent. She says I'm polluting the family. Now she is convinced I'm possesed by Satan because my cheeks aren't red! I need to prove to her that god is not real because a christian can't get along with an athiest. 10 points to best answer