From the back cover:
In a world where the gods are real and shape the daily lives of their adherents, cults are an everyday necessity for every culture in Glorantha. This book provides the structures, myths and modus operandii for the key human and non-human cults of the Orlanthi, Solar Pantheons, God Learners and EWF. From the barbarian cults of Prax through to the esoteric mysticism of the the draconic orders; from the ancient Storm Tribe to the Saints of the Invisible God. Fully revised and compatible with RuneQuest II, Cults of the Glorantha is an indispensable RuneQuest resource.
the error in the description (Cults of the Glorantha) is deliberate. It is verbatim from the back cover