The principle of this book is to use scientific method to question the assumptions or conclusions of religious belief; no particular religion is the focus but rather the belief in a higher being as being in direct conflict with science. Peter Atkins, the author, makes clear in his introduction that his belief is in science and the principle that: We have much to learn, and that because something is not yet understood, it does not prove the existence of a higher being or justify religious belief.
The method of writing is clear and I would say non-offensive - it consists of "Here's the science we know so far. Here's some ideas which are pure speculation but are as provable as religion. Make your own conclusions". The topics discussed are Creation, Birth, Death and the after-life. At just over 100 pages it's a short book but it's got a lot of content (I wouldn't have wanted the book to be much longer) and if you're a fan of Richard Dawkins you may well enjoy this.
However, there is an issue with this book which I see other reviews have touched on which is the style of writing. For me it's written in the style of a headmaster giving a lecture to a school assembly describing what information you know already, what you need to know, and when you should consider each point. I really don't think it needs this style and for me is a real negative on the book. There's too much of the author's ego coming through in the book for my liking, the choice of some words appears to deliberately awkward almost inviting the reader to admit their grasp of the English language is not as good as the author's.
In scoring this book, I would have given 5 stars for the subject matter but the writing is a real irritant.. and in a book, that's quite important.