[Sidenote:  The Arabs ceased, in second century, to be a crusading force.] As the first spread of Islam was due to the sword, so when the sword was sheathed Islam ceased to spread.  The apostles and missionaries of Islam were, as we have seen, the martial tribes of Arabia—­that is to say, the grand military force organized by Omar, and by him launched upon the surrounding nations.  Gorged with the plunder of the world, these began, after a time, to settle on their lees and to mingle with the ordinary population.  So soon as this came to pass they lost the fiery zeal which at the first had made them irresistible.  By the second and third centuries the Arabs had disappeared as the standing army of the caliphate, or, in other words, as a body set apart for the dissemination of the faith.  The crusading spirit, indeed, ever and anon burst forth—­and it still bursts forth, as opportunity offers—­simply for the reason that this spirit pervades the Koran, and is ingrained in the creed.  But with the special agency created and maintained during the first ages for the spread of Islam the incentive of crusade ceased as a distinctive missionary spring of action, and degenerated into the common lust of conquest which we meet with in the world at large.

[Sidenote:  With cessation of conquest, Islam ceased to spread.] The extension of Islam, depending upon military success, stopped wherever that was checked.  The religion advanced or retired, speaking broadly, as the armed predominance made head or retroceded.  Thus the tide of Moslem victory, rushing along the coast of Africa, extinguished the seats of European civilization on the Mediterranean, overwhelmed Spain, and was rapidly advancing north, when the onward wave was stemmed at Tours; and as with the arms, the faith also of Islam was driven back into Spain and bounded by the Pyrenees.  So, likewise, the hold which the religion seized both of Spain and Sicily came to an end with Mussulman defeat.  It is true that when once long and firmly rooted, as in India and China, Islam may survive the loss of military power, and even flourish.  But it is equally true that in no single country has Islam been planted, nor has it anywhere materially spread, saving under the banner of the Crescent or the political ascendency of some neighboring State.  Accordingly, we find that, excepting some barbarous zones in Africa which have been raised thereby a step above the groveling level of fetichism, the faith has in modern times made no advance worth mentioning.[69]

From the Jewish and Christian religions there has (again speaking broadly) been no secession whatever to Islam since the wave of Saracen victory was stayed, excepting by the force of arms.  Even in the palmy days of the Abbasside caliphs, our apologist could challenge his adversary to produce a single conversion otherwise than by reason of some powerful material inducement.  Here is his testimony: