E
You miss the point. God doesn't change; God doesn't fall away; God doesn't abandon anyone. People change, fall away, and abandon God.
So a person who claims to have faith and later walked away NEVER HAD FAITH, they walked away because they felt nothing from God and they did not experience Gods love, hence why they walked away to begin with
It’s not that God failed them, it’s that God knew they did not have real faith