Why RSS had to make each and every person say that they are Hindu. Because Hindu and Hinduism did not exist

The RSS had to make each and every person say that they are Hindu.

Because Hindu and Hinduism did not [originally] exist [as a defined religion].

None of those who said, or say, that they are Hindu ever actually knew how they themselves became Hindu.

That is precisely why the RSS constructed a brand new Hinduism — one that no one, anywhere, had ever defined or articulated — carrying the "Sanatana" claim like a mere joker 

Unable to explain what a Hindu is, how one becomes a Hindu, or how one ceases to be a Hindu.

Instead, they manufactured an enemy, and turned the envy and hatred toward that enemy into the faith and ideal of "Hindu" and "Sanatana" — with no other philosophy of life or proposed solutions to offer.

All while turning the superstitions that creep in through ignorance into the fertile ground they need to grow.