I think the most convincing way to use the bible to show God’s plan for them is to take them to the very beginning of God’s plan to save them from the death that Adam and Eve brought to them when they ate of the tree of knowledge and opened sin to our world.
God immediately gave blood for our sin as it explains in Lev. 17:11. To show this to Adam and Eve, God sacrificed an animal for the skins to cover their nakedness.
For over 4,000 years, animals were used as the sacrifice that prophesied the sacrifice of Christ. Christ fulfilled that prophesy, and we use the sacrifice of Christ for the forgiveness of our sin.
Romans 1:2-5 the gospel he promised beforehand through his prophets in the Holy Scriptures
3 regarding his Son, who as to his earthly life[
a] was a descendant of David,
4 and who through the Spirit of holiness was appointed the Son of God in power[
b] by his resurrection from the dead: Jesus Christ our Lord.
5 Through him we received grace and apostleship to call all the Gentiles to the obedience that comes from[
c] faith for his name’s sake
When we give up living under the ways of the world and accept living by the way’s scripture explains are God’s ways, we are living as a Christian. We are given, not only scripture, but directions within us through the Holy Spirit that we can contact through prayer.