Jerusalem is under assault. In Western diplomatic circles, it is now being argued that by pushing hard for a Middle East settlement, with the redivision of Jerusalem at its core, the flames of radical Islamic rage will be lowered, stemming the tide of al-Qaeda's ideological spread. Yet the exact opposite is true. Radical Islam is fed by its sense of victory in the face of repeated withdrawals: a redivision of Jerusalem would not only endanger its holy sites, but also unleash new jihadist momentum on a scale that most political leaders have not begun to consider.