I would like to suggest that you get THE KINGDOM OF THE CULTS by WALTER MARTIN & RAVI ZACHARIAS, which has been revised and updated for the 21st century. This book is the only one of its kind and should be here on VYRSO. I see that we already have THE KINGDOM OF THE OCCULT here on VYRSO, but THE KINGDOM OF THE CULTS should have been here long before that!