What a conveniently selective and single comparison! Select a religious group that is historically aligned to a geographical location (Utah)
Most religions have a heartland and are not very evenly spread. Mormons are not unusual in this respect, it is JWs who are unusual in being more evenly spread across the globe!
Most Catholics live in Europe and Latin America. Most Jews live in Israel and the United States. Most Hindus live in India. Most Anglicans live in England. Most Othodox believers live in Eastern Europe. Most Lutherans live in Northern Europe. And so on and so on. Mormons are not unusual in being skewed to one geographical region. It is JWs that are unusual because they are comparatively not skewed to one geographical region. That's the whole point!