The Quran states:
"Those who believe, and those who are Jewish, and the Christians, and the Sabeans—any who believe in God and the Last Day, and act righteously—will have their reward with their Lord; they have nothing to fear, nor will they grieve."
This would imply that believing Jesus is God is fine. But since the Quran states that Jesus is not God, how is this different then believing Moses is God or Adam is God? In other words, if someone believes Moses is God instead of Jesus, but otherwise believes and behaves as would a Christian, can they still go to heaven?