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My understanding is, the distinctions between Christian denominations are generally distinctions in the method of worship or minor doctrine, but not distinctions in fundamental doctrine. Thus Baptists, Methodists and Lutherans are all denominations of Christianity with differences in worship and minor doctrinal differences (my wife is Methodist, I am Baptist ... and, other than sprinkling or dunking during Baptism, I couldn’t tell you the difference). Mormonism, Unitarianism, Judaism, and Mormonism have differences in fundamental doctrine which separate them from traditional Christianity (for instance, Christ was not the Son of God (Judaism) or Christ is not the only path to Salvation (Unitarianism).

I have observed that there are basically two things that separate Christian denominations. It's either minor doctrinal differences (like Armenianism vs Calvinism) or it's a disagreement over the nature of Apostolic succession.