Apparently authors can usually choose whether to call their books fiction or nonfiction. But we don’t always know the author’s true identity, as with most of the books contained in the Bible. We recognize that some of the biblical writers made up stories as motivation for people to believe or act in certain ways. Some composed nice poetry, some described events that likely occurred, and some wrote “just so” stories to explain what they didn’t understand. I would classify nearly the entire Bible as fiction, especially the God stories. But since many believe the Bible to be factual, bookstores won’t risk community outrage by filing it under “religious fiction.”

I could write a nonfiction book about how I was abducted by aliens who took me on their spacecraft, showed me my past lives, and described my next life. I could write the same book and call it fiction. Were I to write such a book, I would reluctantly file it under fiction even though a gullible public would undoubtedly buy more of the nonfictional version.

This brings me to “Heaven is for Real: A Little Boy’s Astounding Story of His Trip to Heaven and Back,” a book that climbed to the top of the New York Times nonfiction bestseller list in 2010, and will soon become a movie. On it has nearly 4,000 five-star reviews.

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Herb Silverman is founder and President Emeritus of the Secular Coalition for America, author of “Candidate Without a Prayer: An Autobiography of a Jewish Atheist in the Bible Belt,” and Distinguished Professor Emeritus of Mathematics at the College of Charleston.