From the article you sent:

The relationship between Yahweh and his people is not moral, but strictly contractual and legalistic. According to Jewish scholar Yeshayahu Leibowitz, “The Torah does not recognize moral imperatives stemming from knowledge of natural reality or from awareness of man’s duty to his fellow man. All it recognizes are Mitzvot, divine imperatives.”[3] The hundreds of mitzvot (“commandments”) are ends in themselves, not ways to a higher moral consciousness.

This is true and important. It sets Christianity apart from other religions in the same way it sets Judaism apart.

The author (who is not a Christian) argues what he believes religion should be and argues that Yahweh doesn’t fit that definition, and thus is bad. His definition of religion is essentially humanism. This quote gets to the heart of that humanism, specifically “awareness of man’s duty to his fellow man”, “ways to a higher consciousness”, and “moral imperatives stemming from knowledge of natural reality”. These are humanist concepts. That man can get to God or become God through man’s own actions. The entire point of the legalistic law in the OT is to demonstrate that man cannot get to God on his own. Jesus repeats this. Paul repeats this. It was to demonstrate that we all fall short of the glory of God. No man could be perfect under God’s law. Jesus’ death is the only way to get to God. Without the law there is no sin. If the wages of sin are not death then Jesus didn’t need to die. This article speaks the truth but misses the point because the author’s religion is humanism. Humanism is the religion of Satan. Satan said to Eve, “You can become like God, knowing Good from Evil”. The idea is exactly what the author quoted, “moral imperatives stemming from knowledge of natural reality”. A man “knows” and chooses what is good and what is evil, not God. Man makes the law, not God. Man crowns himself God. This is humanism. Of course humanism hates Yahweh, who created the law. Humanism leads to the clown world we now experience because truth is relative to the changing human experience under humanism. Humans are god under this religion, which is antithetical to the law and Jesus’ death to cover our sins against the law.