I do believe that God reconciled the world to himself through Christ. But we are urged to “Be reconciled” or as the NIV Words it “come back to God” This could very well mean a coming back to God as a Covenant people [ie] Israel, or a coming back of the whole of mankind since the fall of Adam [ie] those outside of Gods covenant people/Gentiles. In either of the cases some form of repentance on the recipients behalf is needed. Unfortunately Most of Israel and most of mankind in General have failed in the act/s of repenting and coming back to God.
Rightly or wrongly, the understanding I get from Gods word, is that he chose Israel
as a people/nation to bring forth his blessings not only for them, but also blessings that through them would reach [eventually] to the ends of the earth.The everlasting beginnings of this, was to come from the established messianic kingdom under Gods rule through Christ and his chosen covenant people, culminating to the eventual and permanent blessing to [all] mankind. Their failure not only starved them of Gods blessings, but also to the rest of mankind. Although this plan suffered a great collapse [caused on mans behalf] this was only to be in part. God still is going to achieve his plan, and that process started at his sons resurrection, which now involves both Jew and gentile together under a n/c forming a spiritual Israel, through which Gods greater purpose will be served again hear on earth. Amongst this working out God through Christ is seeking out a kingdom of priests who will serve with his son, [ie] many are called but few are chosen. I believe it is at Christ’s second coming that the beginnings of this kingdom will again be implemented here on earth, scripture tells us the kingdom will start small but will eventually fill the whole earth. After the second resurrection, it would seem many Will find themselves outside of this new but small beginnings, also those who Christ for told would be there Matt 8:12. This is were I personally believe all those outside the kingdom, who have failed to reconcile themselves to God by way of repentance, Will be in a state of deep regret and torment, it is here outside metaphorically in Gehenna Fire such rebellious attitudes will be dealt with, until the point has been reached that [all] has been reconciled back to God via the path of reconciliation he provided through his son.I don’t see this punishment like God is thrashing his subjects, it’s more they are outside of Gods presence and blessings a place of of gloom, both physically and spiritually were they will be brought to the realisation, life outside of Gods given blessings is a life not worth having. I believe this realisation will bring them into alignment with Gods ways, as and when this is achieved I believe this is how the kingdom will spread,… along with its blessings to [all] Mankind and fill the whole earth.
My point being, I do believe God has reconciled [all] mankind to himself through Christ, but to share in his future kingdom blessings, one needs to align their heart and mind back to God by way of repentance Rom 2:12 + 2 Corinth 7:10, Until that time such ones can’t enter the kingdom.[ie] 1 Corinth 6:9-10 + Rev 21:7. I just see the process and it’s out workings differently, not only to your view but that of many others also, who do believe along similar lines to me.