There is indeed a section where he suggests you recite the lord's prayer backwards, while allowing a candle to burn out, in 3 nights succession.
While the reason he cites for doing it is to "de-condition" you and shake off "old bonds", even I found it a little bit anti-christian. I just don't see that as necessary, really, and would it even mean anything to someone other than a christian anyway? I think I did it one night - maybe - I can't quite remember. I know I didn't do the whole thing.
I remember being annoyed by this when I read Mastering Witchcraft. It seemed to me that he was defining Witchcraft by what it isn't rather than what it is. I dislike the idea of defining either my craft or my faith as "not Christian." Christianity plays no part in my path and I found its prominent place in a book on Witchcraft both irrelevant and a cheap attempt at crowd pleasing.
To be honest I thought this book leaned more toward New Age/Wicca than Trad Craft. Not a book I particularly enjoyed though it does summarise the basics well and for that reason I'd recommend to beginners.