Mohammed knew that most people are terribly cowardly and stupid. That is why he promised two beautiful women to every courageous warrior who dies in battle. This is the kind of language a soldier understands. When he believes that he will be welcomed in this manner in the afterlife, he will be willing to give his life, he will be enthusiastic about going to battle and not fear death. You may call this primitive and you may laugh about it, but it is based on deeper wisdom. A religion must speak a man's language.