Unless you can trawl through academic journals, or read French, there's so little in the way of historical work on indigenous steppe religion. It's great to have this: a survey that pulls together the information, and tries to draw together the common threads, find the steppe-wide religious concepts... animals are his theme, humans-animals, shamans-animals. True, it's largely an excursion through the materials we have for study: from steppe epic to anthropology, but gives you thumbnails of what's written in French and Russian and Hungarian, and is quite exhaustive, even if each stop on the trip is far too brief. As an introductory on steppe religion - before, underneath Buddhism and Islam - what else is out there? Four stars for usefulness.
Now, who's going to translate from French Roux's Religion of the Turks and Mongols? Who can I beg?