Yoga teaches us that we are one with the source, whatever that source is to you. You can call it God, Buddha, Brahma, the Universe, Mother Nature, the Goddess, whatever/however you identify the higher power.
In yoga we learn that we are not our stuff or lack of stuff, our thoughts, our drama, our emotions because all of this is fleeting and impermanent. By quieting our mind through yoga we come to understand that we are really divine, pure light and love. Everyone should be doing yoga. Imagine the possibilities if everyone did.