I was replying to #916 from the perspective of individuals. You perhaps are thinking of your #921 and thinking from a perspective of organized church denominations. People leave those all the time to go to the one they think God calls them to.
Do you think there will be Baptists, Methodists, Presbyterians, Catholics, Lutherans, (orthodox) Episcopalians, etc., in the kingdom of heaven? There will just be The Church of Jesus Christ, made up of the faithful saints in Adam's day, the faithful saints of Noah's day, the faithful saints of Isaiah's day, the faithful saints of Peter's day, the faithful saints of these latter days, and all the other faithful saints of all ages of the world who love God with all their might, mind, and strength, their neighbor as themselves, and keep God's commandments. And the apostles and prophets the Lord sent to lead and guide them in mortality will continue in that relationship in the life to come.
It is individuals who are redeemed by the atoning blood of Christ, not denominations.
Now does that seem less like a non-sequitur?