Answer may be:

"No", Yoga is not a Religion.

Though Yoga has its roots in Hindu culture, it is not a religion. People of different faith and religion can practice yoga because of its underlying benefits. With the growing awareness of the benefits of yoga, it has become popular all over the world.

It is also an alternative form of therapy for our human body. As people of all age groups can practice yoga it is becoming more and more popular and also introduced in schools, colleges, and offices.

There is no religious ritual associated with yoga. Yoga is just a system of exercise that focuses not only on the body but also on our mind. Yoga brings people of all faith together irrespective of caste and culture. Yoga is adaptable so it can be presented in a secular context.