Mouthy, I know how hard it is to bite your tongue when you KNOW they're wrong! I'm a fader (30 years), but at the time I decided to leave, I told my parents face-to-face that I was leaving the dubs because I didn't believe it was the "truth."
My mom was heartbroken, but she decided not to tell the elders about my decision. Over the years, we've kept a (mostly) good relationship, and she was able to watch her grandchild grow up. But many many times, she would make comments about the "end times" and other loaded dub topics. I always refused to take the bait, knowing that an all-out argument could ruin our relationship.
But oh, how I wish I could really talk to her and discuss these things. Maybe I should have. There's just no knowing how one's decisions will turn out.