Yes, this is pretty much the book I was thinking of writing someday as it goes deep and thoughtfully into the real mindset, subjective theories and experience of "natural religion"--Eastern mysticism/New Age-ism/the occult . . . which I plumbed in so many respects during my early spiritual seeking.
The book is called "Embraced By The Darkness" by Brad Scott. . . .
"The Dethronement of God"
"If every soul is Christ in the making, IGNORANT but not sinful, and if every soul is divine by nature, having God, his True Self, already at the core of his being, then external authority and objective truth become meaningless. To be sure, the spiritual seeker will consult his 'experts' on 'ancient wisdom', as it's called; but he will decide how he will believe and whom he will believe. His own judgment and intuition, then become his guides. These subjective faculties, not God, occupy the central position in his life. But the truth is, God, the Supreme Other, is objective--that is, He really exists apart from our subjective experience of Him. His existence isn't contingent upon our belief in Him. We give Him rule over our hearts by accepting His objective reality, having faith in Him, and conforming ourselves to His will, which, again, He has expressed for us OBJECTIVELY. True, the subjective dimension is there--after we have submitted to God; but it's secondary to sacred Scripture, tradition, and right reason. So who or what is at the center of the New-Ager's life? The self--the feted, pampered, rebellious self."
"When one acknowledges the objectivity of God's truth, he will necessarily have to use his mind, body and senses to perceive, understand and practice that truth. He will consult Scripture, take guidance from his pastor, examine orthodox teachings, and study nature. However, he will also pray to the God in whose image he was made, knowing that God abides in him through the saving grace of Christ and yet transcends nature--and the self--altogether. Therefore, to such a one, the body isn't an expendable object, and God--not one's intuition or judgment--must be trusted. This person lives by faith in the Son of God. To become good (righteous) and even holy (sanctified), he relies not on self-effort but on grace, for he knows that 'if righteousness could be gained through the law [Mosaic or karmic], Christ died for nothing!'" (Gal. 2:21)
"By contrast, New-Agers [eastern mystics, occultists, etc.] place their faith in anti-rational, subjectivistic, man-centered methods--in short, in 'natural religion'. Then, glassy-eyed and overconfident, they wait for those satisfying subjective clicks that will pry open the secrets of the universe for them so they too can master their physical vehicles and become divine incarnations or avatars--at last finding themselves, so they believe, on the same 'plane of consciousness' as Jesus Christ. Yet in and through their spiritual systems and methods, they are plainly fooled by their false faith in man. In this way they submit to the oldest sin known to man: pride. They fail to perceive the single lie that lies at the root of their systems and methods. In their "New Age", God isn't manifesting Himself as man; man is masquerading as God."