Have you ever heard of the Feast of Adam and Eve?

Yes, though it’s not a feast day that’s noted much any more. It was popular in the middle ages. To mark the day and the “original sin” that was Adam’s and Eve’s downfall, it was popular to act out the scene in a Christian “mystery play” on December 24. As a prop, an evergreen called the Paradise tree was hung with red apples, a custom which is surely a precursor to our current Christmas tree traditions.