It is not a book on, or about, religion -that's best left to experts. It's not for "mature" Christians -who will, no doubt, find it extremely lacking -perhaps completely "falling short of the mark". It is simply intended to assist three groups who are open to pursuing the Christian path: a) non-believers, b) pseudo-believers and c) believers with limited historical knowledge and/or context.
It's about creating communities of kinship as the foundation for a strong Christian life