Can my grandma force me to go to church?

I'm 15 years old and I've lost most of my faith in god,why? Because I've been through a lot (losing family members,hard struggle) and I've been studying science and science makes more sense to me than religion does. My family are all catholics,however the only devoted and hardcore catholic is my grandmother. She forces me every single week to go to church,I dislike going very much. I know some of you may say to tell her how I feel and I have tried to (in a light way) and she says that it isn't god's fault for anything bad that has happened. She says that church and god is my obligation and top priority in life,I don't agree with that at all. I respect the fact that she chose to follow god but it's my decision not to follow religion. The thing is,if I don't go to church my grandma refuses to talk to me and disowns me. I love my grandma dearly but I want her to understand that I have pretty much don't choose to follow her religion. I do not live with my grandma,by the way,I live with my mom. My mom doesn't say anything about it really. Anyways,I don't want any answers trying to tell me that I need god in my life because just as it's your decision to believe in god,it's mine to not. Thank you.