According LDS theology the Universal Church "apostatize." Please reconcile this with Matthew 16:18, "the gates of hell shall not prevail against it."

The Bible is clear that apostates would creep into the first century Church that Christ builds, but that that would not mean virtually the whole of it becoming so corrupt that it would need to be replaced in latter days, as the LDS teaches. Please note also, that other denominations teach the same thing, but claim their denomination is the one God has raised up to replace 'apostate Christendom'. We can compare LDS theology (already stated in your comments and in LDS answers given) with what the Bible says (as opposed to Joseph Smith's annotated version of it; other similar denominations also claim their writings give 'proper understanding' to the Bible.) Also note that the LDS phrase, "the fulness of the gospel" is intended to teach that only a partial gospel had been given to all the Bible apostles and saints. Claim that some parts of the Bible have been removed or corrupted, and then offer your divinely-guided 'truth' about that, and in no time at all there will be a following, believing you've given them the 'true, full gospel'.

First, Jesus himself warned of wolves in sheep's clothing sneaking in; he warned of false prophets claiming to do wonders in his name; he stated that religious hypocrites both abounded in his day, and would, in days to come. In all cases, he was clear that they would not succeed in stopping the growth of his Church.

Certainly Jesus did speak of problems in his Church in his last words, given to the apostle John when that old saint was on the Isle of Patmos. Jesus detailed seven churches that had seven 'sets' of problems, but also that they were still owned by him. He lovingly warned them of what he saw was wrong with them, and encouraged them where they remained faithful, loving, and steadfast in the faith. But he was also clear that unless the sins being tolerated in some of them were not repented off, judgment would come. "For judgment begins with the household of God" (1 Peter 4:17).

In every century, in every generation since Revelation chapters 2 & 3 were written. the Christian Church has experienced the truth of such matters, building up to the finale when Christ will finally and completely judge everyone, including those in his Church. However, at no point did Jesus ever say that he would have to completely discard his Church, and set up a new one. As the LDS denomination knows this, that is why they are so keen to claim they are descended from the 1st century apostles, with apostolic authority, ministry and gifts. Unsurprisingly, most of the other denominations with similar claims to being a 'restored, true church' loudly claim to being the only 'thin red line' going all the way back.

Of course, a 'thin red line' of faithful Christians does not square with Church history through the centuries. Only those who think they can judge and condemn billions of people over the centuries (without knowing hardly anything about them, individually, or even collectively as groups) would dare be so presumptuous as to call them basically 'corrupt' and disowned by Jesus bar a tiny handful.

That is why LDS theology cannot square their theology with Matthew 16:18 and with Jude verse 3. In the first century, the Church adhered to the teaching of the apostles in that first century (Acts 2:42) - yet some would claim that it is the teaching of modern-day 'apostles' that must be adhered to, which is a foundational LDS doctrine. Jude spoke of the teaching of the first century apostles, not about any future doctrines presented 1,700 years later by new claimants to the title. The simple, biblical test of having received the faith that was once for all delivered to the saints, is that we continue to believe, and to promote, all the apostolic teaching of the first century, and not any 'latter day' ones. The minute any group claims they have received 'special revelation' or 'new light' on biblical doctrine, beware.

The apostasy is foretold/warned about in the bible.

• Amos 8:11-12
• Acts 20:29-31
• 2 Thessalonians 2:3
• 2 Timothy 4:3-4
• Jude 1:4, 17-19
• Revelation 13^*

Matthew 16:17-18

17 And Jesus answered and said unto him, Blessed art thou, Simon Bar-jona: for flesh and blood hath not revealed it unto thee, but my Father which is in heaven.

18 And I say also unto thee, That thou art Peter, and upon this rock I will build my church; and the gates of hell shall not prevail against it.

The rock that he is referencing is revelation, not Peter in particular or the church at the time.¹

Galatians 1:8-9

8 But though we, or an angel from heaven, preach any other gospel unto you than that which we have preached unto you, let him be accursed.

9 As we said before, so say I now again, If any man preach any other gospel unto you than that ye have received, let him be accursed.

The LDS do not believe we are preaching any other gospel.²

• salvation is through/in Christ (Romans 3:23-24)
• the Church is build upon a foundation of apostles and prophets (Ephesians 2:20, Ephesians 4:11-12)
• there is only One Lord, one faith, one baptism (John 3:5, Ephesians 4:5)

Hebrews 8:6-13 does mention a new covenant but covenants can be unfulfilled by man (such as apostatizing).

When we choose not to keep covenants, we cannot receive the blessings, and in some instances we suffer a penalty as a consequence of our disobedience.

The LDS believe in the new and everlasting covenant.

The LDS believe there is One Lord, one faith, one baptism and that because there was a falling away a restoration was needed, which Joseph Smith started (including restoration of the priesthood on the earth).

_{* This chapter has various interpretations, one of which foretells of an apostasy}

_{1 Upon This Rock, Bruce R McConkie}

_{2 Unofficial LDS source, that has several LDS responses to this claim}