A parable is a specific literary form in the Bible, and it's always marked as one. Jesus's parables are introduced that way — "And he spake many things unto them in parables, saying..." (Matthew 13:3, KJV). The text tells you when something is a parable.Yep, if you tell me the antecedent(s) for "that".
The first and foremost Scripture is Gen. 3:1-6.
Genesis 2-3 isn't presented that way. It's written as straight narrative — connected to genealogies, timelines, and generations that continue right through the rest of Genesis and into the historical books. Genesis 5 opens with "This is the book of the generations of Adam" (Genesis 5:1, KJV) and lists Adam as a real person with a lifespan: "And all the days that Adam lived were nine hundred and thirty years: and he died" (Genesis 5:5, KJV).
The New Testament treats it the same way — as history, not metaphor. Paul writes in Romans 5:12 (KJV): "Wherefore, as by one man sin entered into the world, and death by sin; and so death passed upon all men, for that all have sinned." His whole argument about sin and salvation rests on Adam being a real man who did a real thing. Same in 1 Corinthians 15:22 (KJV): "For as in Adam all die, even so in Christ shall all be made alive."
So calling it a "parable/story" to soften it isn't something the text supports — it's a label added from outside. The tree is real, the eating is real, the consequence is real. What's not given is the species of fruit, and that's the one detail scripture leaves out on purpose.