We/I stand on one side of a great chasm and can't understand how the person on the other side could possibly believe what they believe. And they are also looking across at me and thinking the same thing. Empathy--building bridges is the only way to have a relationship. And the relationships that are vital to us require that empathy if they are to survive.
I recently heard of a friend who has left the LDS church telling another friend who has chosen to stay actively engaged in the LDS church that she was crazy to do so. I've heard of other friends who are active in the faith lecture friends who have left about following the prophet and warnings of eternal damnation. Most people are more subtle than these extremes. But really, I'm the only one who knows what's best for me. And you are the only person who knows what's best for you. So let's just be friends.