There are a number of groups who claim Mormonism and claim to be the true church of Mormonism. Kind of ironic seeing as they tout this apostasy and less than 200 years into their founding they have the same thing going on. You have the Church of Jesus Christ of Latter Day Saints(LDS) in Salt Lake City, you have the Community of Christ formerly known as the Reorganized Church of Jesus Christ of Latter Day Saints(RLDS)in Independence, Missouri. Then you have a bunch of small “fundamentalist” groups; some which still practice polygamy.
Just interesting they cite this apostasy and the same thing happened with them, though they never talk about it. If a Mormon missionary comes to your door it would seem like the LDS is the only church that claims Mormonism.