There was some problem of casteism in Hindu social structure as it exists in Muslims throughout the world. We have the courage to accept it but you are not willing to accept the truth for being politically correct.
Saudi prefers and gives more rights to Sunnis (wahabis) and Iran the same way to Shias.
Have courage and accept the truth that Muslim society has not treated all equally. Its by nature discriminating.
I assure you that you can become Hindu without leaving to believe in one God and without being of any caste like 300 million people(practice Yoga,dhyan, vegetarianism) in west have already done. Also we have historically not imposed Yoga or anything on others by force even on tiny minorities.
You can continue to pray the way you want oir even discard the existence of God. That is the beauty of Indian spiritualism which you term as Hinduism
