As other reviewers have noted, this is not an easy book to review. In some ways, God's Gladiators has elements in common with books like Autobiography of a Yogi and the works of Carlos Castaneda (though Wilde is definitely on a different spiritual path from either of these). The problem is, if you haven't personally experienced the fantastic things written about in these books, how do you evaluate their authenticity? If you are a complete skeptic or someone who believes anything on faith, this is not a problem. If however, like me, you are open to almost anything but also skeptical, it can be a tricky business.
In this book, Wilde talks about meeting metaphysical entities such as the mythic Lady of the Lake, malevolent transdimensionals and even the Devil himself (though he confesses that this part of the tale is allegorical). I have read several of Stuart Wilde's books and, although this one is the furthest "out there," all of his work reveals him to be something of a trickster guru type. This, despite the fact that he warns his readers away from gurus and other authority figures. It isn't just what he says, but the way he says it --he is full of wisecracks and a tongue-in-cheek attitude. This does not mean, however, that I don't believe a lot of what he says, only that I don't necessarily take it at face value. For one thing, many of his experiences have the quality of visions or mystical experiences, which often have a subjective quality. That is, what I "see" may be valid for me but not for everyone. The book also contains what I see as certain contradictions. For example, Wilde repeatedly states that anyone who tries to sell you on immortality is conning you. Yet, at the very end he describes, or at least suggests, a way to attain immortality. He tends to paint very broad strokes in dismissing others' beliefs. He mentions that Hitler was interested in Tibetan mysticism, and based on this he rejects everything Tibetan. He likewise condemns Hinduism and Buddhism, the latter for denying the self. Yet Wilde himself tells us we have to get rid of the self we have come to know. This is a common theme of all spiritual traditions, including Buddhism.
I suspect there is a basic truth to Wilde's premise that we are controlled by the Sphere --similar to the Matrix (see David Icke's books for more on this, as well as the Matrix movies of course). Dark entities feed off our fears and negativity and also control all of "our" governments, religions, economies and mass media. The latter will not be news to anyone who has studied conspiracy theories, but Wilde does a good job in exposing this widespread deception. If there is a basic theme to this, as well as Wilde's other books, it is attaining freedom from control.
This is a fascinating book, and I'd recommend it to anyone who is not afraid to go beyond the standard dogmas of most religions as well as self help and new age philosophies. My sense is that it contains a lot of wisdom, some material that is true for some but not others and some hot air as well. It's worth reading it to make up your own mind.