Rejecting Mormonism Means Rejecting Christianity?

I have not been one to call Mormons unchristian, however Mormonism is clearly a radical reinterpretation of Christian (ie. Baptism is not an invention of John the Baptist, the Eucharist was not an invention of Jesus). In this Mormanity entry (click here) we see a frequent Mormon response. According to this reasoning, if a person can reject Mormonism for X, then that person must also reject Christianity for X. Given this type of response it is no wonder so many devout Christians consider Mormons not to be Christians. That is, the response is essentially positing that Mormonism is a gauntlet to traditional Christianity.

Of course to hold Mormons to the same standard, to reject the Strangites for X would also require one to reject modern Mormonism for X. LDS faithful of course reject the Strangites. "Oh, snap!"