The Gospel preached by the church during the church age is preached by human beings.
During the last three and one half years of the age before the second coming of Christ there will be a gospel called
"the eternal gospel" which will be announced supernaturally, not by humans but by an angelic voice.
This is a gospel about the Creator God being responsible for the supernatural calamities that will be happening in the cosmos and on the earth during the great tribulation.
The sheep and the goats of
Matthew 25:31-46 are the recipients of this supernatural proclamation from heaven. And if they heed they have one reaction towards the Lord's persecuted brothers. And if they do NOT heed they will have another and different reaction to the Lord Jesus' persecuted brothers.
Now here is the verse telling us of this
"eternal gospel" preached from an angel supernaturally from the air.
Revelation 14:6,7
"And I saw another angel flying in mid-heaven, having an eternal gospel to announce to those dwelling on the earth, even to every nation and tribe and tongue and people,
Saying with a loud voice, Fear God and give Him glory because the hour of His judgment has come; and worship Him who has made heaven and earth and the sea and the springs of waters."
We must pay attention to the CONTENTS of this
"eternal gospel". It has nothing to do with Christ's death and resurrection. It has altogether to do with God the Creator.
The world will be undergoing such calamities in nature and in the cosmos as have never been witnessed. In the midst of these supernatural calamities the angel from the air announces that the Creator God, He who made the universe is about to judge.
This eternal gospel reminds me of what Romans 1 says about man being WITHOUT EXCUSE to not believe in a Creator God.
"For the wrath of God is revealed from heaven upon all ungodliness and unrighteousness of men who hold down the truth in unrighteousness.
Because that which is known of God is manifest within them, for God manifested it to them.
For the invisible things of Him, both His eternal power and divine characteristics, have been clearly seen since the creation of the world, being perceived by the things made, so that they would be without excuse." (Rom. 1:18-20)
An extraordinary man endowed with all the power of Satan, called the Antichrist, will be proclaiming that he is God. And to counter this the
"eternal gospel" of the true Creator God who alone could be responsible for the events occurring in nature warning of impending divine judgment will be proclaimed supernaturally by the angel in the air.
This preaching of the eternal gospel is to counter the deception upon the world that Antichrist, sitting in the temple of God in Jerusalem, is god.
Meanwhile, Christians left on earth and elect Jews to be saved are the brothers of Jesus, down to the least of them.
They cannot buy, sell, eat, remain always healthy and avoid imprisonment and oppression by an enraged godless society under Antichrist.