Yoga is a science and science does not require arguments to stay alive.Yoga will exist as long as the sun shines and air is still in the atmosphere.
We do not need to classify yoga as belonging to a certain sect,religion, country,race or spirituality. It is a standalone science . a science of mind body balance and an advanced mind development tool.
Yoga is and can only be known by practise, it is too abstract to be known by philosophical discussions, debates,study of the yoga tests, worship of gurus,nor by intellectual