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Just to pick one ... Consider the Epistle of James, which Luther derided as "the epistle of straw." Still, it's generally accepted as part of the Canon of Scripture. Are you suggesting that Martin Luther, in rejecting it, belonged to a different religion than Christianity?
Had he insisted to the contrary, even after being corrected by his colleagues, then he would have belonged to a different religion.
That a man so deeply egotistical and headstrong as Luther would bow on this point is testimony to how essential the canon is.