The trouble with kingdoms of heaven on earth is that they're liable to come to pass, and then their fraudulence is apparent for all to see. We need a kingdom of heaven in Heaven, if only because it can't be realized.
Whoever will cultivate their own mind will find full employment. Every virtue does not only require great care in the planting, but as much daily solicitude in cherishing as exotic fruits and flowers; the vices and passions (which I am afraid are the natural product of the soil) demand perpetual weeding. Add to this the search after knowledge... and the longest life is too short.
Like the Nazis, the cadres of jihad have a death wish that sets the seal on their nihilism. The goal of a world run by an oligarchy in possession of Teutonic genes, who may kill or enslave other 'races' according to need, is not more unrealizable than the idea that a single state, let alone the globe itself, could be governed according to the dictates of an allegedly holy book. This mad scheme begins by denying itself the talents (and the rights) of half the population, views with superstitious horror the charging of interest, and invokes the right of Muslims to subject nonbelievers to special taxes and confiscations. Not even Afghanistan or Somalia, scenes of the furthest advances yet made by pro-caliphate forces, could be governed for long in this way without setting new standards for beggary and decline.