Mormon fundamentalist

A Mormon fundamentalist is someone who believes in a religion called Mormonism that is similar to regular Mormonism, but they believe in it a little differently. They believe that the religion should stick to the original ways that it was practiced a long time ago, which means they do things like having more than one wife and wearing special clothing. It's like when you play a game with your friends and you all agree on what the rules are, but then one friend wants to stick to the old rules even when everyone else has changed them. That friend would be like a Mormon fundamentalist. They still believe in the same religion, but they want to follow it in their own way.