How Would You “Take the Roof Off” a Denial of Objective Beauty?

Questions about whether it’s possible to go your whole life without sinning, why God put the tree of the knowledge of good and evil in the garden, and how to “take the roof off” the claim that beauty is not objective.

• Does Romans 9:11 lead to the conclusion that it’s possible to go your whole life without sinning if you try hard enough?
• Why would God put the tree of the knowledge of good and evil in the garden in the first place?
• How would you “take the roof off” the claim that beauty is not objective?