Before the creation of the earth there was Life (eternal life, for it existed in eternity) and death. God is the Father of Life while the devil is a steward of death. Just as a man carving a statue of himself God created natural life (the earth) to be a type, a picture or rather a statue of the Life. As such there was the Life and there was also the statue of the life; both exist simultaneously. God's eternal plan is to merge the two together. The Life came and merged with flesh; he became a man and that man's name is Jesus.
Life and its statue became one in the man Jesus. But God's plan was not just to merge Life with a man but to merge Life with the whole earth. This is why Jesus said he came to give life and to give it abundantly (John 10:10). The Bible also said Jesus came to reconcile all things to God (Col 1:20). Life must fill the whole creation for the two to be completely merged together. Jesus came to fulfill that mission but he planed to do it in steps. First he would create a body for himself by filling a group of people with Life. After he had gotten this body he would then fill the whole earth with Life through this body.
"The church is Christ's body, the fullness of Him who fills all in all." (Eph 1:23).
Notice I didn't mention the fall at all. This is because this plan has nothing to do with the fall. Whether man sin or not God had set out to execute this plan. Whether the devil deceived Eve or not God would have still send Jesus to come and give eternal life.
"He indeed was foreordained before the foundation of the world, but was manifest in these last times for you" (1Pet 1:20).
"[Resting] in the hope of eternal life, which the ever truthful God Who cannot deceive promised before the world began." (Titus 1:2).
Hence, the gospel is not all about, 'man sinned and God had to send Jesus'. "Now to Him who is able to establish you according to my gospel and the preaching of Jesus Christ, according to the revelation of the mystery kept secret since the world began" (Rom 16:25). Paul is saying, the Gospel he preached is the eternal mission. To Paul the gospel is not just, 'man sinned and God had to do something'. Instead the Gospel Paul preached was, 'God conceived a plan before the foundation of the world and set up to fulfill this plan through Jesus and his body' (read Eph 3:7-11). The Gospel is not limited to, 'God has saved us from sin and now we can make heaven'. It is not about making heaven, it is about filling all things with Life — Christ is this Life.
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