فِي مَشِيئَتِهِ وَحُكْمِهِ
They remain subject to Allah’s will and judgment.
A monotheist who dies having committed major sins may deserve punishment. Yet people do not themselves determine with certainty whether that person will be forgiven or punished; the ultimate case rests with Allah.
This neither trivializes sin nor imposes eternal punishment on every unrepentant sinner. Sin, repentance, forgiveness and final judgment must be distinguished.