The definition of religion is a controversial and complicated subject in religious studies with scholars failing to agree on any one definition. Oxford Dictionaries defines religion as the belief in and/or worship of a superhuman controlling power, especially a personal God or gods. Others, such as Wilfred Cantwell Smith, have tried to correct a perceived Judeo-Christian and Western bias in the definition and study of religion. Thinkers such as Daniel Dubuisson have doubted that the term religion has any meaning outside of western cultures, while others, such as Ernst Feil even doubt that it has any specific, universal meaning even there.