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'The Prayer', 1918. Muslims kneeling in prayer. From La Vie de Mohammed, prophete d'Allah (Life of Mohammed, prophet of Allah) by Etienne Dinet and Sliman Ben Ibrahim (1918). (Photo by Ann Ronan Pictures/Print Collector/Getty Images)

'The Prayer', 1918. Muslims kneeling in prayer. From La Vie de Mohammed, prophete d'Allah (Life of Mohammed, prophet of Allah) by Etienne Dinet and Sliman Ben Ibrahim (1918). (Photo by Ann Ronan Pictures/Print Collector/Getty Images)