Yoga is not a religion. It has no creed or fixed set of beliefs, nor is there a prescribed godlike figure to be worshipped in a particular manner. Religions for the most part seem to be based upon the belief in and worship of things (God or godlike figures) that exist outside oneself. The core of Yoga’s philosophy is that everything is supplied from within the individual. Thus, there is no dependence on an external figure, either in the sense of a person or god figure, or a religious organization.
The common belief that Yoga derives from Hinduism is a misconception. Yoga actually predates Hinduism by many centuries. Ancient seals unearthed in the Indus Valley provide clear evidence of widespread Yoga practice earlier than 3,000 B.C.E. The techniques of Yoga have been adopted by Hinduism as well as by other world religions. Yoga is a system of techniques that can be used for a number of goals, from simply managing stress better, learning to relax, and increasing limberness all the way to becoming more self-aware and acquiring the deepest knowledge of one’s own self.
The practice of Yoga will not interfere with any religion. Many American Yoga Association students who have practiced Yoga intensively for many years continue to follow the religious traditions they have grown up in or adopted without conflict.