Is it necessary to worship God for yoga practices?
For those who love to worship in their tradition, that is very good. For those who are not inclined that way, it is not the end of the world. Yoga can progress very well with or without formal modes of worship. Yoga works either way.
There is enlightenment both with and without God. This is because human beings are inherently enlightenable, transformable to a higher state of evolution, regardless of the belief system utilized. We could say that all of existence is headed in that direction, from the rocks up through all the kingdoms of living things. Everything is moving forward. Humanity is no exception. We humans have an added ability to consciously accelerate the process, to choose a fast track, which is what advanced yoga practices are about. We can turbo-charge the evolutionary process.