If casteism in Hinduism is bad and Islam a reforming religion then Islam followers looks like read everything with one eye. The islamic religion brought the concept of treating losers in War as Slaves from their roman rulers to this part of Hindus.
A religion which enslaves another human being because it of losing in war is nothing but barbaric. The islamic followers only took advantage of the tolerant and generousiy of Hinduism in war to ultimately defeat them and rest is history.