[JimRed]

But of course, they are NOT Christian denominations.

Are you saying that they (Mormons and Jehovah's Witnesses) reject Jesus as Messiah and Savior?

[Flavious_Maximus]

Mormon’s present “The Book of Mormon” as holy scripture.

Jehovah’s present “The Watchtower” as holy scripture.

Both groups push false prophets (Joseph Smith and Charles Russell) that are outside the realm of Christendom.