Eliza Griswold’s The Tenth Parallel is a tour of what the late historian Samuel Huntington called “Islam’s bloody borders,” although Griswold has little use for either Huntington or his theories. She shies away from attributing violence or virtue to any particular religion and limits her focus to the African and Asian places where the world’s largest and fastest-growing religion, Christianity, competes for souls with its second-largest and second-fastest-growing, Islam.

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