A phenomenal research effort and literal leap of faith. I've read a number of his books, like The Secret Science at Work, and this one is less pragmatic, more about the epistemelogical parallels between Huna and other religions, such as Christianity. Brilliant and subtle, Long's insights reconstitute familiar Christian symbolism and open new pathways into it. May his research be of use to humanity.
His reseach gives you the idea that this code can be found in any religion around the world. It is a way of life and not a religion but can be brought into any religious setting, without hurting the religious ethics.