You should know I am a KJV only believer. The Holy Spirit seals the believer. One must be a believer first before having the seal of the Holy Spirit. The order is: hear the gospel, believe the gospel, sealed with the Holy Spirit. That's the order. The Holy Spirit does NOT indwell the believer before one hears and believes.
You need to understand the KJV has some pluses but it is flawed by 400 years of changes in the English language. Also there are mistranslations of different animals 5 of which do not exist. Here is a list of problems.
For example, because of the changes in the English language, a number of words occur in the King James that make zero sense to most people today. These include the following nuggets that you will find scattered here and there:
Almug
Algum
Charashim
Chode
Cracknels
Gat
Habergeon
Hosen
Kab
Ligure
Neesed
Nusings
Ouches
ring-straked
sycamyne
trow
wimples, ….
The King James translators also translated some animal names into animals that in fact we now have pretty good reason for thinking don’t actually exist:
unicorn (Deut. 33:17)
satyr (Isa 13:21);
dragon (Deut 32:33) (for serpent)
cockatrice (Iswa 11:8),
arrowsnake (Gen 49:11, in the margin).
Moreover,, there are phrases that simply don’t make sense any more to modern readers: Phrases that no longer make sense:
ouches of gold (Exod. 28:11);
collops of fat (Job 15:25);
naughty figs (Jer 24:2);
ien with (Jer. 3:2);
the ground is chapt (Jer 14:4);
brazen wall” (Jer 15:20);
rentest thy face (Jer. 4:30);
urrain of the cattle (Exod. 9:2);
And there are whole sentences that are confusing at best, virtually indecipherable (or humorous)
And Jacob sod pottage (Gen 25:29)
And Mt. Sinai was altogether on a smoke (Exoc. 19:18)
Thou shalt destroy them that speak leasing (Ps. 5:6)
I trow not (Luke 17:9)
We do you to wit of the grace of God (2 Cor. 8:1)
Ye are not straitened in us, but ye are straitened in your own bowels (2 Cor. 6:12)
He who letteth will let (2 Thes 2:7)
The words of the wise are as goads, and as nails fastened by the masters of assemblies, which are given from one shepherd (Eccles. 12:11)
Other sentences make sense, but would today be considered somewhat problematic – at least for the sacred Scripture. My favorite is the one that refers to a man who: “Pisseth against the wall:…. 1 Sam 25:22, 34, I Kings 14:10!