Take a moment to be still. Recognize that you are attending the information in the UBook from a conditioned perspective, based on previous learning.
My experience of A Course in Miracles was fraught with difficulties because of my inability to "let go" of previous learning. The same was true with the Urantia book.
As beings conditioned with the error of ego, we tend to take an absolutist position when it comes to Truth. We feel that two things cannot be true, and while this may be the case with Ultimate Truth (Ground of all Being), it is not the case with relative truth. The first section of the UB covers this topic more fully.
Furthermore, the UB, from what I have been able to comprehend thus far, has a more linear paradigm it teaches, where the truth's presented by Yogananda, Advaita, and others teach non-dual. It may be difficult to recognize how both can co-exist in the mind, though this difficulty will vanish when the real purpose of our existence is made aware.
We are here to discover our True nature as a Child of God. Our experience as a planetary will-creature is neither our Truth, nor is it a permanent state of being. And as we walk this earth as creatures, we harbor a Divine Light (TA, Holy Spirit) which has never not been fully with our Father.
Enlightenment, then, becomes the full recognition of this fact, and leads to a transformation of being. This transformation then directs us inward (Spirit-led), and our sojourn (return) begins, in which time the entirety of Creation has been designed to assist.