Does the Mormon church condemn other religious systems? The answer is definitely, "Yes." Let's look at Mormon writers and see what they have said.<quoted text>
We don't call all other Christians denominations of the devil and apostate.
Joseph Smith said ...
(Regarding Joseph Smith's alleged first vision where celestial personages appeared to him.)...) "My object in going to inquire of the Lord was to know which of all the sects was right, that I might know which to join. No sooner, therefore, did I get possession of myself, so as to be able to speak, than I asked the personages who stood above me in the light, which of all the sects was right and which I should join. I was answered that I must join none of them, for they were all wrong, and the personage who addressed me said that all their creeds were an abomination in His sight: that those professors were all corrupt ..." (Joseph Smith, History of the Church, vol. 1, p. 5-6).
"What is it that inspires professors of Christianity generally with a hope of salvation? It is that smooth, sophisticated influence of the devil, by which he deceives the whole world," (Teachings of the Prophet Joseph Smith, compiled by Joseph Fielding Smith, p. 270.)
(In questions directed to Joseph Smith, the founder of Mormonism...)
First -- "Do you believe the Bible?"
If we do, we are the only people under heaven that do, for there are none of the religious sects of the day that do."
Third "Will everybody be damned, but Mormons?"
Yes, and a great portion of them, unless they repent, and work righteousness." (Teachings, page 119.)
Brigham Young said...
"But He did send His angel to this same obscure person, Joseph Smith jun., who afterwards became a Prophet, Seer, and Revelator, and informed him that he should not join any of the religious sects of the day, for they were all wrong," (Brigham Young, Journal of Discourses, vol. 2, 1855, p. 171).