When we limit God salvation to just man we do much damage to the scriptures, and put a limit on the only one who is without limit. We diminish the fullness of the cross of our Lord by saying it only reaches to mankind. ALL THINGS in heaven and earth and under the earth are reconciled by way of the cross. And yes that includes Satan.
Ephesians 1:10 10 That in the dispensation of the fulness of times he might gather together in one all things in Christ, both which are in heaven, and which are on earth; even in him:
Philippians 2:10-11 10 That at the name of Jesus every knee should bow, of things in heaven, and things in earth, and things under the earth; 11 And that every tongue should confess that Jesus Christ is Lord, to the glory of God the Father.
Just by these two scriptures above we can see that all things in the heaven will confess that Jesus Christ is Lord. But not only those things in the heavens, but those things in the earth and under the earth also confess that Jesus Christ is Lord.
ALL THINGS are reconciled by way of the cross of our Lord.
Colossians 1:16-20 16 For by him were all things created, that are in heaven, and that are in earth, visible and invisible, whether they be thrones, or dominions, or principalities, or powers: all things were created by him, and for him: 17 And he is before all things, and by him all things consist. 18 And he is the head of the body, the church: who is the beginning, the firstborn from the dead; that in all things he might have the preeminence. 19 For it pleased the Father that in him should all fulness dwell; 20 And, having made peace through the blood of his cross, by him to reconcile all things unto himself; by him, I say, whether they be things in earth, or things in heaven.
Now least any say, but Col.1:16-20 says nothing about Satan being reconciled, I would point out that ALL THINGS in heaven, ALL THINGS in the earth, both visible and INVISIBLE, are reconciled.Also note that it states that THRONES, DOMINIONS, PRINCIPALITIES and POWERS are also reconciled by way of the cross.
So who are these THRONES, DOMINIONS, PRINCIPALITIES and POWERS?
Ephesians 6:12 tells us.
Ephesians 6:12 12 For we wrestle not against flesh and blood, but against principalities, against powers, against the rulers of the darkness of this world, against spiritual wickedness in high places.
Now according to the above scriptures even those things we war against ( devils in high places ) are reconciled by way of the cross.
And the light shineth in darkness; and the darkness comprehended it not.
Note that the LIGHT shineth IN the darkness.The darkness also has the Light and in the dispensation of the fullness of times, that Light is going to shine out of great darkness.Yes the darkness will be gone for only the Light that is within it will remain, same as with us.
ALL THINGS are reconciled by way of the cross , I do not place a limit on Gods salvation for it is without limit.
8 Unto me, who am less than the least of all saints, is this grace given, that I should preach among the Gentiles the unsearchable riches of Christ; 9 And to make all men see what is the fellowship of the mystery, which from the beginning of the world hath been hid in God, who created all things by Jesus Christ: 10 To the intent that now unto the principalities and powers in heavenly places might be known by the church the manifold wisdom of God
Praise God His cross is without limitations.