Irrelevant point. Yes, Manusmriti laid out the basis of the caste system, but it was based more on the work done by people and not the way it is followed today. As for the reason why caste system has not been abolished, it has more to do with the so-called lower castes getting huge benefits from reservations and not willing to let go of it.
For all the rhetoric, you have not been able to explain how Manusmriti is similar to the concept of Sharia in Islam, which was the original point of this debate.
I am not qualified to speak on other religions, so lets just stick to Hinduism here. Advaita Vedanta is the fundamental belief of Hinduism. Can you deny the concepts laid out there ?