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In 1943, Oursler was received into the Roman Catholic Church. The following year, his son was converted to the Catholic faith, and his wife returned to her childhood faith a year later. His daughter converted in 1948. "The Greatest Story Ever Told" was published in 1949. It was followed by "The Greatest Book Ever Written" in 1951, and "The Greatest Faith Ever Known", completed by his daughter, April Oursler Armstrong, and posthumously published in 1953. The film, "The Greatest Story Ever Told", based on Oursler's book, was released in 1965.