I read the entire book. I will be blunt and brutally honest. It seems painfully obvious to me that it was written by a group of separatist Seventh Day Adventists at the budding origin times of the new age movement.
Such is simply my belief though. If one is inclined to believe that we live on Urantia, the 606th planet in Satania which is in Norlatiadek which is in Nebadon which is in Orvonton which revolves around Havona, all of which revolves around the center of infinity where God dwells, more power to them. The book does indeed convey some very positive "universal truths" I am inclined to agree with. Such as:
The experience of dynamic religious living transforms the mediocre individual into a personality of idealistic power.
Give every developing child a chance to grow his own religious experience.
Human likes and dislikes do not determine good and evil; moral values do not grow out of wish fulfillment or emotional frustration.
These are good, positive concepts, which I think can be derived wether or not one wants to believe in the theology.