And you know this because?
Because it is the basis of the Christian faith, found in both the scriptures (e.g., John 1:1-13, Matthew 16:16, etc.) and all the other foundational Christian writings (e.g., the Creed, the ancient shared by the most ancient churches of Christianity like the Trisagion/Agios, "O Monogenes Yios", the "Is Pateer"), etc.
What is divine nature?:
(New Testament | 2 Peter 1:4)
4 Whereby are given unto us exceeding great and precious promises: that by these ye might be partakers of the divine nature, having escaped the corruption that is in the world through lust.
As you have shown here by your excerpt, it is that by which we escape the corruption of the world. Christ, having known no corruption by sin, since He knew no sin (2 Corinthians 5:21), as He was by the divine nature sinless, has offered us the same promise by His incarnation, that we may be
partakers in the same divinity by which He
naturally experiences no corruption.
Thus we do not
become God ourselves (as in Mormonism; God forbid!), but become
like God in becoming sinless and hence knowing no corruption (immortality), by our union with Him. It is, as I've heard one Eastern Orthodox priest put it, "union without fusion", which seems good enough to me despite not being Eastern Orthodox personally.
But that is again the crucial difference between Mormonism and Christianity: we may
become like Him (not become Him!) in this very certain way by our union with Him, whereas He never had to become [like] Himself (?) by any process; He always was and always is and always will be, because that's of His nature as God (He is eternal and unchanging).
So Mormonism is 100% wrong and at odds with Christianity when it teaches, as in the King Follett sermon or elsewhere, that God needed to learn and progress to
become God from his previous status as man, and hence you and I can do the same. No. That's blasphemy of the highest order.