You don’t need to tell me about Hinduism. And no, cast system is not “integral” to Hinduism. In fact it’s got nothing to do with Hinduism. And how exactly is cast system, polygamy? I didn’t quit get that part.
The analogy of a Christian lad going to college and becoming secular “to fit in” isn’t anywhere even close to a Hindu lower cast temporarily playing Christian to get freebies and then going back to his original religion.
Secondly less then a 1/4th of India converted to Islam under intense persecution and genocide not to skip taxes. Catch up on some history.
Lastly your post still doesn’t explain how it’s an attack on cast system.
I am not sure how you separate the caste system from Hindu polytheism. I don’t being that a particular caste will follow a particular god or philosophy, but India is divided into many nations, so to speak, in ways more complex than Europe, and religious opinion is equally complex. But diversity does not mean that toleration, as we understand the term, is the order of the day. There is a pecking order.