So are you saying that by eating fruit from trees that are pleasant to look at and good for food, we obtain the right to set our own standards of morality and immorality? Surely it is God Who sets that standard. Sin is disobedience of His commandments.
It is a mandate of the People to set up what is Morality & Immorality by using our senses.
It is pertaining to physical life and not spiritual life.
It is not come from God.
Look at the different countries in this world in which they have the standard what is morality and immorality although they don't believe in the Lord Jesus Christ.