Think, Jae, Think. It would dissuade from even trying to follow after God. If the decision is God's, and is already made, nothing we decide or nothing we do can change it. If God has decided we are doomed, then helping all the elderly in the universe across the busy streets isn't going to help us. If God had decided we are 'elect', then teargassing all the migrant women and children who happen to be on the wrong side of an international border isn't going to hurt our chances. There's absolutely no motivation for change or repentance or transformation, if the decision is already rendered by forces beyond our control. We're just automotons, going through the motions.
Redbaron, I believe that when someone is chosen to follow God, that's just what they're chosen to do - follow God.
Said following absolutely incorporates things like repenting, participating in Church, serving others, and being strengthened through God's Word and sacraments.
It also includes renunciation of the ways of the world.
For the record, I do not believe that God decides to doom certain people. That's an extreme Calvinist notion which I don't hold.