Nor could you explain why John wrote what he wrote on the subject [about becoming a god], since John’s words like I have said are reasonable and specific and give a clear picture that becoming like God is exactly what he was writing about.
That is a warped Mormon interpretation of what John was writing about. But if you take the plain text of Revelation, John was talking about the same thing the other apostles (especially Paul) wrote about - becoming an adopted son of God and a joint-heir with Christ, inheriting all that the Father has (eternal life). John never says that men will become Gods like the Father. You may want to read that meaning into the text, but it is simply not there.
You mentioned John’s descriptions of what awaits “him that overcometh”. Let’s take them one at a time:
1.Revelation 2:7
To him that overcometh will I give to eat of the tree of life, which is in the midst of the paradise of God.
This means that the saved will live forever in the paradise of God (heaven).
2.Revelation 2:11
He that overcometh shall not be hurt of the second death.
The second death is the death of the soul - being cut off completely from the presence of God - we call it going to hell. The saved will not go to hell.
3.Revelation 2:17
To him that overcometh will I give to eat of the hidden manna, and will give him a white stone, and in the stone a new name written, which no man knoweth saving he that receiveth it.
I know the Mormons love this one because you think it alludes to the temple endowment, but it does not. Those elements of the endowment were created in the 19th century to conform to this passage, not the other way around. And Mormons have no “hidden manna”, the new name is written on paper not in stone, and my new name is Cornelius and so now you know it. Mormons also think that when they get to the celestial kingdom, they will each be given their very own seer stone (as if God needs a seer stone to know things). But all that is Mormon fantasy and has nothing to do with what John wrote.
Catholics understand this passage thus:
“Hidden manna” refers to the manna preserved in the ark of the covenant (Ex 16:32-34; Heb 9:4) which was a type of Christ in the Eucharist (the Bread of Life). The saved person feeds upon the flesh and blood of Christ in life, and is given a fulness of the presence of Christ after death.
In the bible, white connotes purity and stone connotes permanence.
In the bible a “new name” always means a change in one’s relationship to God, a new identity and a new covenant. Entering heaven entails all three.
4.Revelation 2:26
And he that overcometh, and keepeth my works unto the end, to him will I give power over the nations: 27And he shall rule them with a rod of iron; as the vessels of a potter shall they be broken to shivers: even as I received of my Father. 28And I will give him the morning star.
More about inheriting the power and authority of Jesus. Isaiah and Paul (Rom 15:12) both spoke of Jesus ruling over the nations (i.e.:the gentiles). If we are to inherit and reign with Christ then of course we too will rule the nations.
5.Revelation 3:5
He that overcometh, the same shall be clothed in white raiment; and I will not blot out his name out of the book of life, but I will confess his name before my Father, and before his angels.
An allusion to the transfiguration of Christ wherein His raiment was white as snow (John was there), perhaps also the angel who rolled away the stone at the resurrection (John saw the angel, too). John is saying the same thing the other apostles taught, that Jesus “shall change our vile body, that it may be fashioned like unto his glorious body”.(Phil 3:21)
6.Revelation 3:12
Him that overcometh will I make a pillar in the temple of my God, and he shall go no more out: and I will write upon him the name of my God, and the name of the city of my God, which is new Jerusalem, which cometh down out of heaven from my God: and I will write upon him my new name.
The “pillar in the temple” is a reference to the pillars in 1Kings 7:21 and 2Chron 3:17 and would have been very significant to Jewish readers. The pillars had names written on them. To become one of the pillars of the temple was a symbol of great honor.
7.Revelation 3:21
To him that overcometh will I grant to sit with me in my throne, even as I also overcame, and am set down with my Father in his throne.
Again, saying what the other apostles wrote, that the saved will rule and reign with Christ. See 2Tim 2:12.
8.Revelation 21:7
He that overcometh shall inherit all things; and I will be his God, and he shall be my son.
Again, joint-heirs with Christ (Rom 8:17), adoption as sons (Gal 4:5).