Have read some reviews and just got started on this book - basically, I've got through some of the pages the author of this review found objectionable. I enjoyed them and am going to press on, anticipating that I'll find the book stimulating and informative. I've read some of Tom Holland's other histories and although he's not an historian of the first rank he is a talented summariser and populariser.
This is a history book and not a religious work and I'd guess that anyone who's not reconciled to the idea that religious movements have historical roots and that religions are cultural artefacts will not find this a comfortable read. I gather the book is even handed and takes a similar approach to the three major monotheistic faiths so the author may have cut himself out a tidy parcel of grief!
I'd suggest this isn't a book for anyone who doesn't like being unsettled. Read something else instead?
I'll post again with my review when I've finished the book.