Is not speaking up the same as lying?

I'll try to keep this short and to the point. So I was raised Christian, as I got older my beliefs changed and I no longer affiliate with that religion and I don't believe much of what is in the bible. I like Christian music and recently went to Women of Faith with my grandmothers, my mom, and my boyfriend's mom. Those women (and most people in my life) all believe I'm a Christian and I've never corrected them but I feel like it's a lie not to. I'm just scared I'll be judged for my beliefs. I guess I'm in the closet about my faith.