I would have to disagree with that. I've been doing this a long time and never has seen a Mormon "horrified" in any way that the Catholic and LDS Church are close to being the same, in fact, I've seen just the opposite. We often recognize our similar heritage. Are you sure you ever actually asked that question?
I recommend that you start posting on the Mormon threads on the Unorthodox Board and would be happy to join you in a discussion of the relationship between the RCC and the LDS. There have, at various time, been RCC posters there who did not last long because of the negative reception they received from the LDS posters. I, as well as others, have raised the issue of the connection between the two denominations from time to time. After much hemming and hawing, most LDS posters try not to answer and admit that the Catholic Church is part and parcel of the Great Apostasy. When directly confronted with RCC posters, they can be quite direct and confrontational, however.
I don't recall Joseph or Brigham saying much negative about the Catholic Church, but it is true McConkie and Orson Pratt had some words, similar to the Protestant view in relation to the Catholic Church being the harlot/Church of the Devil that the Bible refers to. Were you thinking of them instead? Of course, such a view was never LDS theology, both men being corrected on the issue when their views were known.
This is from the Wikipedia article on the Great Apostasy:
"The Church of Jesus Christ of Latter-day Saints
LDS Church members believe that
Joseph Smith, Jr. was called by God to restore the true teachings of Jesus Christ
According to
The Church of Jesus Christ of Latter-day Saints (LDS Church), the Great Apostasy started not long after Jesus'
ascension[4] and continued until
Joseph Smith's
First Vision in 1820. To
Latter-day Saints, the Great Apostasy is marked by:
Beginning in the 1st century and continuing up to the 4th century AD the various
emperors of the
Roman Empire carried out violent persecutions against Christians.
[9] Apostles,
bishops,
disciples and other leaders and followers of
Jesus who would not compromise their faith were persecuted and martyred. The
persecutions were so successful that near the end of the 3rd century under the reign of the Roman Emperor
Diocletian, monuments were erected memorializing the extinction of Christianity.
The LDS Church declares that all
Priesthood leaders with authority
[4] to conduct and perpetuate church affairs were either
martyred, taken from the earth, or began to teach impure doctrines, causing a break in the necessary
Apostolic Succession. Latter-day Saints believe that what survived was but a fragment of the light and truth that Jesus had established: the Church of Jesus Christ, as established by him, was no longer to be found on the earth. Survivors of the persecutions were overly-influenced by various pagan philosophies either because they were not well indoctrinated in Jesus' teachings or they corrupted their Christian beliefs (willingly, by compulsion, or with good intentions but without direct revelation from God to help them interpret said beliefs) by accepting non-Christian doctrines into their faith. Latter-day Saints believe that many plain and simple truths of the gospel of Christ were, therefore, lost.
[4]
Latter-day Saints understand various writings in the
New Testament to be an indication that even soon after Jesus'
ascension the Apostles struggled to keep early Christians from distorting Jesus' teachings and to prevent the followers from dividing into different ideological groups.
[10] Latter-day Saints claim that various Old Testament and New Testament scriptures, including teachings of Christ himself, prophesy of this "falling away" or "apostasy." The Christian believers who survived the persecutions took it upon themselves to speak for God, interpret, amend or add to his doctrines and ordinances, and carry out his work without proper authority and divine direction from God to do so. During this time, important doctrines and rites were lost or corrupted. Latter-day Saints point to the doctrine of the
Trinity adopted at the
Council of Nicaea as an example of how pagan philosophy corrupted Jesus' teachings.
Mormonism teaches that God, the Eternal Father, His Son, Jesus Christ, and the Holy Ghost are not
one substance, but three separate and distinct beings forming one
Godhead.
[11] The Latter-day Saints reject the early
ecumenical councils for what they see as misguided human attempts without divine assistance to decide matters of doctrine, substituting debate or politics for divine
revelation. Latter-day Saints believe that the often heated proceedings of such councils were evidence that the church was no longer led by revelation and divine authority.
Thus, Latter-day Saints refer to the "restitution of all things" mentioned in
Acts 3:20-21 and claim that a
restoration of all the original and primary doctrines and rites of Christianity was necessary.
[10] The LDS believe that God the Father and His Son, Jesus Christ, appeared to a 14-year old boy named
Joseph Smith and called and ordained him to be a prophet.
[12] Through Christ's Priesthood authority and divine direction from Christ, the LDS believe that Joseph Smith was called and ordained to re-establish Christ's church. Hence, members of the LDS faith refer to their church as "The Church of Jesus Christ." The term "latter-day saints" refers to the fact that members of Christ's church were originally called "saints" and that The Church of Jesus Christ of Latter-day Saints is Christ's restored church in these, what LDS and other Christian denominations believe, are the last days prior to prophesied second coming of Jesus.
[13] Latter-day Saints maintain that other religionsChristian or otherwisehave a
portion of the truth, though mingled with inaccuracies due to misinterpretations of some doctrines, such as the nature of the Godhead, how
Adam and Eve's
choice in the Garden of Eden and their fall advanced the
Plan of salvation, the need for modern divine revelation through living
prophets and apostles, and the universal divine potential of mankind. They claim that
The Church of Jesus Christ of Latter-day Saints is the restoration of Jesus' original church, has the authentic Priesthood authority, and all doctrines and ordinances of the Gospel, fulfilling many of the prophecies of Daniel, Isaiah and Malachi in the Old Testament and also the prophesies of Peter and Jesus in the New Testament. (See Ref.) They also maintain that many other religions, Christian and otherwise, advance many good causes and do much good among the people insofar as they are led by the light of Christ, "which lighteth every man that cometh into the world." (John 1:9)
True. I would agree we have some commonality with them also since they were around the same time, but there seems to be more retained consistency with the Catholic Church. As well, I'm not "as" familiar with them as I am the Catholic Church, thus I can't speak much on how similar they are. I have looked at them briefly, but never got into any depth because the "there-there" wasn't there in my view.
I recommend that you do look into the Orthodox churches. I think you might be surprised at what you find.