My Mother left long before I did. Thinking back on it now, it was a bit of a role reversal and kinda makes me laugh. When I turned 18 she started listening to heavy metal, smoking pot, and had a boyfriend that she lived with.
She never got DF'd but I always knew that if she was I would never shun her. I just could never do that. I was born into the religion and heavily indoctrinated. But I'm so happy that I had the presence of mind and the human decency to know the silent treatment is no way to treat those we love.
If someone offered me a million dollars to never talk to my family again I would turn them down. If they offered me a medical treatment that would give me eternal youth but I could never see my family again - I would turn them down. And if they offered me a chance to live in a paradise but I had to forsake my family and watch them die in an apocalypse - I'd politely tell them to f*** off!