Rejecting the Creator/creation paradigm is at the core of this belief. Nothing unique about it; it is just repackaged Babylonian / Pagan / Gnostic / Theosophic / Pantheistic doctrine which demotes the Creator as being on an equal plane with His creatures and/or His creation.
Some claim to be God, some claim "God is Everywhere" meaning that He is not a Unique and Personal Being who is ALWAYS greater and above His creation as a Loving Father.
The humanistic mind cannot fathom a greater, higher and more powerful source to whom it owes its life and whose commands it must obey. Nothing new under the sun.