Adam is mentioned predominantly in the writings of Paul within the New Testament - scripture inspired by the Holy Spirit, and through His grace understood.
Luke describes Jesus’ lineage as originating with Adam. Subsequently Adam appears in the gospels, when Jesus is quoted saying that we leave our parents and become again one flesh as man and woman.
This person, Paul, and if you doubt his “idea”, I wonder why you would not doubt his actual existence, was struck blind by and spoke directly with Jesus.
Yeah, I have faith in his “idea” and He who gave him that understanding.
Ultimately, the Source is to be found in our relationship with God.
I trust your involvement in this forum is a part of your Journey to the Truth; you will find all your answers in your relationship with God.
The Bible is the dialogue between God and Humanity, the Church the vehicle, by which we get to paradise together.