Certainly not .But you should have total faith in what you practice otherwise it will be fruitless .If you want to practice Yoga you must have faith in Yoga.

It is important to note that there is not universal agreement on these points, nor the definition of Yoga, with many feeling that Yoga is not a religion, and many people feeling that Yoga is a religion. See the comments below related to commingling Yoga and religion. See also the quotes and articles linked below, where others are describing the relationship between Yoga and religion. See also the section about making your own choice regarding Yoga and religion.

Yoga is not a religion. It is a philosophy that began in India an estimated 5,000 years ago. The father of classical ashtanga yoga (the eight-limbed path, not to be confused with Sri K. Pattabhi Jois’ Ashtanga yoga) is said to be Patanjali, who wrote the Yoga Sutra. These scriptures provide a framework for spiritual growth and mastery over the physical and mental body. Yoga sometimes interweaves other philosophies such as Hinduism or Buddhism, but it is not necessary to study those paths in order to practice or study yoga.

It is also not necessary to surrender your own religious beliefs to practice yoga.