Of course the only difference between Protestant and Mormon is timing - both religions think thsey can have a bible with and without what ever they see fit at that point in time.
One came during the reformation to worship Luther and one came later to worship Joeseph Smith, but they are both heretics at heart.
If I am a heretic by choosing not to be Catholic and allowing a man to dictate when, where, and how I worship based on his latest whim then I can come up with some descriptions of the Catholic Church for you that I will for go listing as not to insult any Catholics as you have just done many Protestants.
While I do agree that Mormonism is not Christianity you could not be more wrong about mainstream Protestant faiths like Methodism, Baptists, Presbyterian and others.
Worship Luther? bwhahahaha
Excuse me but if I'm not mistaken the Church and Mormons uses extra writings to develop their doctrine. Protestants are the ones who tout sola scriptura if you'll recall.