I understand where the back and forth can be confusing, but studying philosophy, for example, the existentialists in particular, at their very outset, they began to divide and disassociate from one another's positions into a confusion menagerie of wild beasts. Most were fanciful and impractical illusions (delusions?). My point is that it seems to me the author pointed out the choice of relying on our own human opinions by which we are persuaded of the existence of some standard of morality which we csan mold and shapte to adapt to our present situation or we can be persuaded to accept the reality and authority of God and the Bible - and not relying on the menargerie of wild misinterpretations. My response the the mystery of the question, "Why does God allow evil?" is found in 2 Peter 3:9, "The Lord is not slow in keeping his promise, as some understand slowness. Instead he is patient with you, not wanting anyone to perish, but everyone to come to repentance." Understanding that the word "sin" really means harm, harmfulness, as an action we do to ourselves and/or to others. God is not to blame. He created Mankind with the power of the will to choose. We constantly choose badly as is reflected in all the world and in each life.