Sometimes we do feel the need to devote to something higher than ourselves, and there is a force behind us which is greater than all we can think of, but again there is no need to be superstitious about that, as it is the case with some people, (For example, people suffering with OCD or anxiety can have a hard time as they might keep pondering upon if they did a particular ritual in the correct manner or not)
God can be a deity you worship to, or the frame of a deity you put up on your bedroom wall. The same god can also be in the oil lamp you are lighting up in the morning, or in the chants that you chant in a satsang. The Brahman is a force that unites all of us, the god that you pray to in the temples is the same Brahman that is inside of you, if you treat your body and mind like a temple keeping it away from negative afflictions and worldly sufferings, you are worshipping the inner force within you which is a subset of a bigger cosmic energy. Some worship this energy, in the form of action, some in devotion. Some go to the temples, some touch the feet of their gurus. At the end of the day , it is your Shraddha or devotion about how grateful you are to the universe.
Therefore, the traditional wisdom of yoga also supports that, out of the 9 main Darshanas, there are 3 Nastik Darshanas, and they have a major role in the history of humanity and yoga too, even though they do not believe in deities or specific Gods.
