With all love and respect Brian, I think we should refrain from reading such material.
Deu 12:30 take heed to yourself that you are not ensnared to follow them, after they are destroyed from before you, and that you do not inquire after their gods, saying, ‘How did these nations serve their gods? I also will do likewise.’
1 Chr 10:13 So Saul died for his transgression which he committed against the LORD, even against the word of the LORD, which he kept not, and also for asking counsel of one that had a familiar spirit, to enquire of it;
14And enquired not of the LORD: therefore he slew him, and turned the kingdom unto David the son of Jesse.
Ex 23:13 And in all things that I have said unto you be circumspect: and make no mention of the name of other gods, neither let it be heard out of thy mouth.
Deu 6:14 Ye shall not go after other gods, of the gods of the people which are round about you;
And there are dozens of other scriptures commanding us not to enquire, go after, serve or have anything to do with other gods which are pagan gods and traditions. The Church systems we have come out of have taught us more than enough pagan traditions, hocus pocus beliefs, blasphemies and heresies, without reading books about such things. I prefer to use my time to study Gods word, rather than to study pagan traditions.
You say that every Christian should read this book, my understanding of the scriptures I've posted here and the dozens more that are similar would suggest to me that NO Christian should read this or any other book relating to pagan religions and traditions.
God be with you Brian.