Theosophy: Any of various religious or philosophical systems claiming to be based on or to express an intuitive insight into the divine nature.
This volume is really two distinct books in one.
Part One: Theosophy and Spirituality for the 21st Century is an attempt to update and enhance spiritual ideas that have been standard in traditional religions for thousands of years.
Part Two: Organized Religions discusses the various aspects of organized religions and whether they satisfactorily represent the one true God, creator of the Universe.
Plus 2 bonus sections: 10 Tenets for the Third Millennium and Questions to Ask Yourself When Choosing a Religion