By what means is the duality of man and God confimed in Biblical text as apposed to monistic union with God?

Upon reading the four Gospels traditionally accepted by Christian faith as Dogma and studing the old testiment as well as the Gnostic Gospels, the Dead Sea Scrolls, the Christian Apocrypha, Jewish Pseudepigrapha, the Kabbalah, the Koran, as well as the contemporary works of Pagan Gnostics such as Hermes Trismegitus and Mani, and Plotinus as well as Philo to round out and instill a sense of fairness in study I have not found the rift. Where, in what book, is it?