>>Beginning with Joseph Smith, Mormon prophets have steadfastly proclaimed all Christian denominations were in a state of apostasy.<<
I don’t think the Mormons are alone in deciding that no church has gotten the Lord’s intent and set out to do better only to find their human failings introduce new problems.
In fact that’s pretty much the story of every every church.
Cutting and pasting and adding onto Scripture, making it into something entirely other than what it originally stated, however, is NOT the story of "every church." At the moment, I can only think of two religions which have done that: Mormonism and Jehovah's Witness.