For more than 10 years, Brendan Smith has been telling the story of the Bible in a very unusual way: with Legos. Through his hit Web site and three popular books, Smith has spread the gospel of “The Brick Testament.” But now, because of what it says are concerns about “mature content,” Sam’s Club, one of the nation’s largest retailers, has banned in-store sales of the fourth book in the series, “The Brick Bible.” On his Web site, Smith’s Brick Testament contains a series of interpretations of sexually suggestive passages of the Bible, but in the latest book version, those...