How can i tell my mom i dont believe in Catholicism?

my mom just took away my iphone, ps3 and friend privileges just for my beliefs i found myself challenging the catholic religion and highly disagree on many points and even tho im 15 my mom says i should still go to make her happy but i see it as i dont ignore my beliefs to make people happy how can i tell her in a way she understands that i dont believe in catholicism and wish to explore other religions oh and her excuse for all of this is she just thinks i think its boring