The Jewish Talmud says that the righteous peoples have an equal place in paradise. The Christians and Muslims agree in rejecting that; they claim that they are the fortunate recipients of God's final message and those who accepted will go to heaven and those who rejected go to hell. So there is a long struggle between the Dar al-Islam and the Dar al-Harb, which in effect was Christendom. This was the perceived enemy. And this has inevitably colored the perception of everything else.