Yoga is the path to God-realisation. Yoga is the path of Divine Experience, and the Divine Experience is the heart of religion. Trying to attain God-realisation is the very heart, the very essence of religion. There are a hundred houses, only a built palace is there, no one is living. It is a deserted palace.
Yoga comes as the life-giving force.
Once again it makes spring into life the spiritual centre of your religion. It makes your religion alive for you. It can make religion alive for anyone, be he a Christian or a Muslim, and it gives back to you the life within your religion. It is the common experience of many people that after Yoga came to them they started being really religious. It has no meaning, and once now he has found meaning, he begins to get interested in it.