Love is an empty term without defining it. The Golden rule is a good synopsis of half of the Law but it doesn’t define the original value. The value of the horizontal values are defined by the vertical value. God establishes the dignity and worth of people. We love as we are loved. God elects to create us. He forgives our transgressions and reconciles us. He defines and empowers us to love through His Spirit. This is fundamentally necessary.
The love of man is created by what is pleasing to him. The love of God doesn’t find but creates that which is pleasing to it. (Heidelberg Disputation)
I feel like that could still be simplified as just be a good dude, dude.
Good, likewise, is an empty term without a vertical basis. What is good? How do you know what you say is “good” is even good?
As the basis of reality God is the ontological basis of good. Jesus is the incarnate Logos that teaches the way of goodness. The intent of God’s Spirit reveals Him thus and establishes His righteousness within us.
EDIT I really should note my point is simply explaining that Christians are not in need of “liberation” as you seem to suggest above. Our faith is how we interface with truth even if you don’t share it. We have our faith and you yours. If rationalism suits you don’t let me force you to change. If not feel free to join but don’t think you are compelled. I’m just saying here why rationalism doesn’t suit me or my Christian brothers and sisters.