I've told my parents, whom i confused on what they believe exactly but they're both pretty different and don't follow any specific religion, they didn't care. There are a good number of atheists in my school so no one really cares (I'd say 40% or more). I'm pretty sure some of my teachers are or have been as well. Also I get along well despite having arguments with theists rarely, usually over stupid things like some kid that told me to burn in hell because I said happy zombie day or some stuff. I laughed my ass off and told him I rather go to hell if it existed, we still talk regularly and stuff, I don't think he even remembers to be honest. There's other ones too, but I don't hold it against them they're nice people over all.