The Pharisees of old and Atta might be comparing notes tonight but I don't think it's taking place in paradise.
Right and what did Jesus say from the cross? "Father FORGIVE them for they KNOW NOT what they do." And what was the parable where Jesus talked about the servant who was "ignorant of the masters will. Though he deserves a harsh beating, he will receive a light one." It depends on WHY you reject the Gospel. If you know that Jesus is the way the truth and the light and then you reject him, you are in serious trouble. But if you have been raised all of your life to believe that the Muslim faith is the only true faith that pleases God, it is very hard to believe otherwise just because some preacher comes along and hands you a bible. God is fair. He looks at your heart and at all the complex things that make you what you are and hinder or help your free will.
This is not to say that the Christian faith is no better than any other. It is the fullest expression of God's will. As Paul said, "Woe to me if I do not preach the Gospel."