Hello Nathan I understnad what you are saying, the idea that upon the cross everything was completed and finished in spirit and needs to be worked out in the natural.
I partially agree with this, yes the penalty of our sins have been paid for and even death itself cannot defeat what Christ did on Calvary, but I also believe in free will. You seem to think that salvation to all men means that all will be saved, but notice that Christ, even love does not force anything. Christ says I come at the door and knock, the person must answer the door, or Christ remains on the outside.
Also in order to defeat sin one must yield to Christ, now I think that most men will bow to Christ, but I also think that many people, even as the number of the sand as the seashore, will reject love and reject Christ.
This is spoken of in Revelation, where armies from Gog and magog will surround Jerusalem and attack the holy city. Also in Revelation and spoken throughout the gospels, no murderer, liar, sorcerer, thief will enter into the holy city, but will be cast alive into a lake of fire burning with brimstone. So it is my belief that all men will be given a chance to know Christ but if they CONTINUE to reject his ways, then there is no more sacrifice for sins(in the bible) and so the penalty of death is the result of sin. the wages of sin is death, but the gift of God is life, one must accept a gift!. Take a look at what Peter says, he says that spots they are without blemish, where they will dwell in the midst of darkness forever. This is just one of many scriptures that tell us the fate of the wicked.
If you say the cross, means that there is no punishment and the murderer can keep on murdering for eternity, because the cross, paid for the murderers salvation, then you are making the cross a license to sin and sounding more like a new ageist.
If you say the cross, will burn out all sin from all men, then you are now FORCING ALL PEOPLE to be changed, whether they like it or not, this goes against Christs teachings of choice and free will. Will a hardcore Satanist accept Christ as saviour, will someone like Hitler, this is presumptious teaching.