What is salvaton
Salvation comes to all that calls on the name of Jesus Christ. Jesus Christ is the Lamb of God slained before the foundation of the world, He is salvation for mankind before He ever spoke mankind into being.
God already knew before the foundation of the world, before the world was created that man would fall in the garden of Eden, therefore the Lamb of God was already prepared to give His life after man fell in the garden.
In the realm of time, Jesus came and died for our sins, fulfilling His purpose as the Lamb of God that took sin on Himself and our punishment, so we would not have to. What is salvation - all that call on the name of Jesus Christ will be saved and granted eternal salvation in Him.