This is how conversation between Pakistanis and supposed Indian professionals like Joe and other think tanks start.
Pakistanis to Indian: We ruled you for 1000 years, enslaved you blah blah
Indians to Pakistan: Actually you didnt rule us, you just converted and forget about your great history. And just because of being Muslims you guys now claim to be rulers of India for 1000 years.
Pakistanis to Indian: You know what you are right, we converted and our history is indeed great Harappa Civilization, Vedic & Ghandara civilization. And we are proud of it thanks for reminding us.
Indians to Pakistanis: Stop right there, you guys are claiming our heritage. These all are "Indian" civilizations. Please look elsewhere for your identity.
but shan i strongly beleive that IVC were monotheists and after so many generationS changes occured in IVC .