Quora? Seriously? I've read scriptures which say being a Nastik is a part of being Hindu.

How many scriptures have you read? Bhagwad Gita? Ved? Ramayan? Mahabharat?

Gita itself doesn't have the word Hindu in it.

Hindu word was created by Arabs and it is a short of Al-Hind, i.e. those living beyond River Hind aka Indus.

Again, null and void