Well I'm not sure how you have to believe the Garden story fits into the salvation aspect, but I do understand that the Garden story is an explanation as to why we need salvation. Why is mankind a fallen race in need of a savior. How did that all happen? God provided that explanation as to why and how it occurred. Paul says it very well. We all came into the world as sinful beings because of Adam. We can all be made righteous because of Jesus. You know this. God was good enough to explain it to us even though he did not have to.
That should be important should it not? Remember what Paul says in Corinthians about the deep things being revealed? Those deep things are revealed to us. We should take them seriously even if we don't completely understand them.
The Bible says we are born sinners and that begs the question coming from our curious searching minds as to why? Why am I born into sin? God explains why. And the writers of God's word understood why. That then begs the question of if Paul who was one of the apostles and Jesus who is the Christ believed it because he was there and the apostles received the understanding of the mysteries of God believed it why don't we? What makes us way more enlightened than the Christ and the apostles who received the understanding from God himself?
That's what I struggle with. It's not a matter of salvation. But a lack of grasping the depth of the truths revealed. To me the claim of greater enlightenment than Christ or the apostles shows a lack of humility and a very superficial understanding of Scripture. If the bible says something and claims something it behooves us to to say it's important.
However, we speak wisdom among those who are mature, yet not the wisdom of this age, nor of the rulers of this age, who are coming to nothing. But we speak the wisdom of God in a mystery, the hidden wisdom which God ordained before the ages for our glory, which none of the rulers of this age knew; for had they known, they would not have crucified the Lord of glory. But as it is written:“Eye has not seen, nor ear heard,Nor have entered into the heart of manThe things which God has prepared for those who love Him.” But God has revealed them to us through His Spirit. For the Spirit searches all things, yes, the deep things of God. For what man knows the things of a man except the spirit of the man which is in him? Even so no one knows the things of God except the Spirit of God. Now we have received, not the spirit of the world, but the Spirit who is from God, that we might know the things that have been freely given to us by God. These things we also speak, not in words which man’s wisdom teaches but which the Holy Spirit teaches, comparing spiritual things with spiritual. But the natural man does not receive the things of the Spirit of God, for they are foolishness to him; nor can he know them, because they are spiritually discerned. But he who is spiritual judges all things, yet he himself is rightly judged by no one. For “who has known the mind of the Lord that he may instruct Him?” But we have the mind of Christ. - 1 Corinthians 2:6-16
Bible Gateway passage: 1 Corinthians 2:6-16 - Common English Bible