"Like a puppy, I need guidance."
If you don't put your faith in what God wrote as historical narrative in Genesis, then who or what are you putting your faith in to say that it isn't a literal life & told how long Adam lived as accurate & true?
It mentions the total days he lived as well as people all through Genesis & all through all the books of the Bible clear through to Revelation! One cannot isolate Adam's life as not true without throwing out all the rest of people's total lives in Scripture.
One has to realize that the Hebrew people kept an extremely careful listing of people's lives & their geneaologies. They were very accurate.
If they were lying about Adam or trying to deceive us as to how long he lived, then He was lying about how long Abraham lived or how long Jacob lived or how long Moses lived or how long king David lived, etc.
Do you realize that every single day of every person's life is recorded in God's book about them, let alone every tear we have ever shed? God cannot judge anyone justly without have a record of their lives each & every day & what happened, whether good or bad.
Psalm 139:16 You saw my unformed body before I was born. Every day of my life was recorded in Your book. Every moment was laid out before a single day had passed.
Job 4:5 Since his days are determined & the number of his months is with You & since You have set limits that he cannot exceed...
Psalm 56:8 You keep track of all my sorrows. You have collected all my tears in your bottle. You have recorded each one in Your book.
Matt 10:26-28 “But don’t be afraid of those who threaten you. For the time is coming when everything that is hidden will be revealed, &all that is secret will be made known to all. What I tell you in the dark, speak in the light; what is whispered in your ear, proclaim from the housetops. Do not be afraid of those who kill the body but cannot kill the soul. Instead, fear the One who can destroy both soul & body in hell.
That is literally how much God cares & is concerned for us, every single moment of every day in our lives.
The problem is people are ignorant of God's Word as Jesus repeatedly showed: 'have you not read, is it not written, have you never heard', etc.' The best interpreter of the Bible is the Bible itself.