A fairly good way to determine who falls under "Christianity" is to looks at the ancient creeds - ie. the apostles creed.
Catholics, Protestants, Orthodox, all agree on everything in those creeds. How the words are defined/interpreted, etc, might vary slightly, but there is agreeance on the creed. They are all Christians.
Mormons, JWs, etc, pretty much don't agree with a single line of those creeds. They are not Christians.
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