The idea that science and religion are mutually exclusive is a modern invention. The idea was to devise methods to discover how the world works. To reveal the truth in God‘s creations.

It’s not about science OR religion. It’s not one or the other. Both are devoted to truth, to reality. At least they should be. And both require a certain amount of faith. There is a law of science that suggests proof of God. Newton’s First Law of Motion: the tendency of a body when in motion, to remain in motion, and when at rest, to remain at rest, unless acted upon by an outside force. I’ve read some leading edge quantum physics described as revealing God. Another one has shown particles existing far away from each other and behaving as though they communicated to each other instantly. I don’t know how anyone could make such an experiment, but it seemed to be true. Science without doubt is not science. Religion without truth is not religion.

To me, the Lord is One, primarily means God is Truth. He created everything. He is timeless. Eternal. God is not the flavor of the day, or the latest fad to be dropped when something else catches your attention. He’s the real deal. In John 14:6, Jesus said: I am the way, the truth, and the life. No one comes to the Father except through me. To me, this means the way to have goodness in life (now and forever) is by choosing truth and life. That is the only way.

The Great Commandment is a two in one kind of thing. If you love God with all your heart, then you will also love all of His children. You can’t really have one without the other. Other translations of the verse are a little clearer. Here’s the KJV: And thou shalt love the Lord thy God with all thy heart, and with all thy soul, and with all thy mind, and with all thy strength: this is the first commandment. Mark 12:30 And the second is like, namely this, Thou shalt love thy neighbour as thyself. There is none other commandment greater than these. Mark 12:31 You can compare different translations easily online. For example: https://www.biblegateway.com/passage?search=Mark%2012:31&version=KJV

Perhaps because you can be courageous and honest while also being mean-spirited. Courage and honesty are good qualities, but they are more like tools since they can be used for good or bad.