Who Are the Mormons? The Church of Jesus Christ of Latter-day Saints: Has over 12.5 million members worldwide and is one of the fastest-growing and most centrally controlled U.S.-based religions Is by far the richest religion in the United States per capita, with $25 to $30 billion in estimated assets and $5 to $6 billion more in estimated annual income Boasts such influential members as Senate Majority Leader Harry Reid and presidential candidate Mitt Romney