Origen believed in the UNIVERSAL salvation of mankind. He found evidences for this viewpoint in scriptures. Other ECF’s also accepted his teachings, even after St. Augustine rejected the principle.
There is much scriptural support of Universalism, when seen from the Christian Biblical perspective. Christ asked God to forgive all those who had condemned him and conducted the crucifixion … because they did it from IGNORANCE. Christ also teaches that the LEAST will be FIRST, in the Kingdom. This might be pointing toward a timefactor [of ‘purgation’ or conversion] needed to correct the ‘ignorance’ of many. Our Church teaches that those who don’t know Christ as Lord, due to ‘ignorance’ … will be dealt with less harsh, and may ultimately be saved. Even our recent/current Popes have held out this as a possibility. God teaches that man is never to pass judgement on another’s salvation status.
St. Peter teaches that Christ went to the underworld and preached to the OT dead … and took a ‘host’ of captives with him to Heaven. Perhaps those who reject or lack knowledge of Christ in NT times … will have a similar final personal visitation by our Lord.
In the Parable of the 2 Sons, one did God’s will after first declining. The other accepted, but did not comply. In the explanation thereof, to the Temple Elders Christ said “… tax collectors and harlots go into the Kingdom of God BEFORE YOU. … Therefore I tell you, the kingdom of God will be taken away from you and given to a nation producing the fruits of it”. So, we see the Jewish Nation losing out the the Gentile Nations. Nevertheless, scripture teaches if we Gentiles are not faithful, we will be ‘cut off’ from the Olive Tree and the Jews grafted back in.
Additionally, we have the circumstances of the American, Pacific, and other Natives … who lived for many years apart from knowledge of Christ. We know God will be merciful on those who by no fault of their own … didn’t receive knowledge of Gospel. The Final Judgement will be the equalizer, so it would seem. God’s judgement will be PERFECT and FAIR. Those w/o knowledge of God via ignorance or lack of opportunity, will see a great light … and perhaps a form of Catholic Purgatory or Christian Universalism will bring all mankind to salvation.
If ORIGEN and those other ECF’s were right, and St. Augustine wrong, it would have to be enabled by Grace from Christ, and in conformity with scriptures … not by a means of Non-Christian Universalism, as taught by the Unitarian Church.