I can't imagine ever lying to someone about my core beliefs just for the sake of preserving a relationship. If the relationship is worth preserving, then lies would never enter the equation in the first place.. at least that's my philosophy and so far I haven't been disowned by anyone
Well, welcome to my world! I'm in a position where only three people, two of my closest friends, know, and one teacher. Not my family, and none of my other friends, many of whom I would consider very close.
My senior year of high school (public) I was in a sociology class and two speakers came in to talk to us. Both of them, near the end of the speech said, and I quote, "you have to have God in your life. You're nobody without God. You're not human."
At the time, my teacher was the only one in the class who knew I was an atheist, and it would stay that way. We had marriage come up at anotehr time, talking about marriage between different faiths, and people didn't eprceive how an atheist could marry anyone. Lots of comments like "that would be weird," "how would that work" etc.
You leanr to learn with it. One of my best friends is a pretty die hard Christian; goes to church every Sunday, no premarital sex, doesn't say "God Dammit" or anything like that. We're really close, and I know that if I told her I was an atheist that she would still like me, but there would be a chism. Interestingly, I'm the only friend of her's who has never drank, had sex, etc., but who cares. I worry about my relationships if people knew, and I think that I am justified in that.