Fraud in the name of religion is far more common than many would think, and in fact, there are scams carried out in the name of religion or even within a religion to obtain money or commit tax fraud. One fairly well known fraud is to claim being Kosher, and sell goods as being Kosher when they are not.
Religious fraud also goes by another name, pious fraud, or pious fiction, which has a slightly different twist to it than religious fraud, but whose primary goal is still to steal money. Pious fraud may involve a counterfeit miracle or a portion of scared text falsely credited to some famous biblical personage. In this instance, along with fleecing people for money, the other goal is to make them more faithful while stealing their money.
This particular term was first used in 1678 by Edward Gibbon, and you will find it used frequently in his tome The History of the Decline and Fall of the Roman Empire. However, more modern day examples of religious fraud should include mention of Jim and Tammy Faye Bakker and Jimmy Swaggart.