There is "considerable disagreement as to the precise definition and proper usage" of the term "modern Paganism". Even within the academic field of Pagan studies, there is no consensus about how contemporary Paganism can best be defined. Most scholars describe modern Paganism as a broad array of different religions, not a single one. The category of modern Paganism could be compared to the categories of Abrahamic religion and Indian religions in its structure. A second, less common definition found within Pagan studies—promoted by the religious studies scholars Michael F. Strmiska and Graham Harvey—characterises modern Paganism as a single religion, of which groups like Wicca, Druidry, and Heathenry are denominations. This perspective has been critiqued, given the lack of core commonalities in issues such as theology, cosmology, ethics, afterlife, holy days, or ritual practices within the Pagan movement.