There shall not be found among you any one who burns his son or his daughter as an offering, any one who practices divination, a soothsayer, or an augur, or a sorcerer, or a charmer, or a medium, or a wizard, or a necromancer. For who ever does these things is an abomination to the Lord. Divination is seeking to know what to do in a way that ignores the word and counsel of God. And that is exactly what disobedience is based on. Disobedience of God's word puts my own wisdom in the place of God's and thus insults God as the only sure and reliable source of wisdom.
Disobedience is idolatry.
When God says one thing and we consult the little wizard of our own wisdom and then stubbornly choose to go our own way we are idolaters. We have not only chosen to consult ourselves as an alternative to God, and thus become guilty of divination, but we go beyond that and actually esteem the direction of our own mind over God's direction and become guilty of idolatry. And worst of all, the idol is our own self. So it stands to reason that God will be displeased with disobedience because at every point it is an attack on his glory. It puts the fear of man in the place of the fear of God.