Here is what I am getting at, we as Human beings made the advancements of the past two centuries....
Just reading off that sentence.. idea channel on transhumanism: [link]
Replace all that paragraph with technology. Its the same idea that somehow being kings we were better off. The Kings of the bible were not perfect as displayed by Solomon and various corruptedness in the bible. Or as said by Seraphim, the Christian of the dark ages weren't so perfect either. I mean its called dark ages for a reason.
And lastly, it is really wrong to say democracy or republic is freedom. Its actually fact that alot of communist or really controling countries were once a free country.
And realize Christ's return isn't Immediately to the throne. He still has to arrive in battle on a white horse during a devastating war.
By the time Christ comes back in the Second Coming it will be to late. However the Bible speaks of an Anti-Christ who will come doing miracles, claiming to be Christ, and getting many people to believe. I think we need to watch out for that but it will be interesting to see how people take to it.
To quote Nietzsche, "God is dead, we have killed Him".
But no, seeriously, I think people just won't accept it at this day and age. There WILL be non-believers, and the events of Revelations will happen. Probably not literally, but the basic idea of the anti-Christ and non-believers waging war on heaven and God's followers will be generally what happens. But I believe that the Holy Spirit would guide the true God's followers, Christian or not, to the truth and be on God's side. Also, God forgives and understands the situation people would be in, so I don't think people would be sent to hell.