That's odd. When I read it, it said the power of God unto salvation, not the power of men.
Why on earth do you think that agreeing with the truth (believing) has some magical power to create reality? You believing the sun will rise does not make it rise. You believing it will rain when the skies are grey does not make it rain. Our believing does nothing to alter the situation. The reason the situation changes (from death to life) is because this is what the LORD God has promised to those who believe.
John 3:16
Now you say those verses don't teach this,
I never said that and honestly how you even heard that boggles my mind. What I said was John uses "kosmos" two ways. It represents the entirety of the world and it's inhabitants
or it represents the Satan like thinking system, but at no time have I found John ever use the word "kosmos" to represent believers
only.
I showed you three verses where John used "kosmos" in the former sense. You chose one verse that John used "kosmos" in the latter sense but
neither of which represent believers only yet you want to say the three verses I chose has "kosmos" as being only believers and the verse you chose as "kosmos" representing unbelievers only. You don't even have a consistent view of who is the "world" but leap back and forth from opposing definitions to suit your narrative.
Christ came to save sinners to which the whole world belongs. He is the Lamb who takes away the sin (singular ie the sin barrier which comprises of everyone's sin) of the world we call Earth which is composed of sinners (that's all of us) so that
whosoever can believe, not just a select few and to those who do find themself believing the truth that is made known by the grace of God, God delivers them from the kingdom of darkness into His Kingdom, from death to life (regeneration), from condemnation to justification. He does not save you (regeneration) to save you with the Gospel.
Do you have any other verses that teach that Jesus paid the debt of every individual?
He didn't pay it piecemeal. You can't remove the sin barrier by leaving pieces of the sin barrier. That is not taking it away. It's either gone for all or it is not gone at all. The Lord does not look into His books Rev.20:12 to see whose sins were not nailed to the tree but whose work is compliant with His command to believe in the Lord Jesus Christ. Jn.6:29 All sins were nailed to the tree which, is how the Lamb can take away the sin of the world.
If anyone wants to know if their individual sins are paid for? There is but one place to be, I'll give you a hint, it is not in the world.