>>but how should we look at Matt 25 Sheeps and goats then?<<
The book of Matthew and the accounts within the book are an account of what he saw during his time with the Messiah. Remember, although the book is called, “The Gospel of Matthew”, it is not the gospel as in the gospel of grace through faith.
Blessed are those who believe, yet not see. That would be you and I and those who accept Jesus as savior. The gospel (the news that is almost too good to be true) began after Jesus was resurrected, ascended and cast His precious blood on the mercy seat of heaven in the temple of our God. This is when the gospel actually began.
The account of Jesus’s life in the gospel of Matthew was Jesus teaching under the law. For instance when Jesus was speaking of plucking out your eye for it is better that...you know the story, Jesus was preparing those under the law to enter into a new covenant. Jesus was teaching those folks how impossible it was to keep the law. How utterly dependent upon HIM and HIS work on the cross.
The separation of the sheep and goats is Jesus speaking of those who would come to believe and those who would embrace the lies of the world.
It is Jesus plus nothing. It is all Him and none of us. Once we are sealed as Christ’s own forever...there is nothing we can do to add to it nor take away from it.
Sin becomes a struggle...not a sentence of eternal separation from the Father.