Renowned as a printer, scientist, and diplomat, Benjamin Franklin also published more works on religious topics than any other 18th-century American layperson. Born to Boston Puritans, by his teenage years Franklin had abandoned the exclusive Christian faith of his family and embraced deism. But as Thomas Kidd reveals, Franklin's beliefs were also shaped by George Whitefield, the era's greatest evangelical preacher; his parents; and his beloved sister Jane. Drawing from Franklin's correspondence, essays, and almanacs, Kidd unpacks the contradictions and conundrums of Franklin's faith.