A right is something no one can take away with out just cause . At the present time I have the "right" to own a gun. (or more than one as the case may be.
) No one can take my guns away unless I get convicted of a felony.
A privilege can be earned, but can also be taken away with or without just cause. It is a privilege to work a job in this country, but if the boss walks in and says "you're fired" you lose that privilege until you find another job.
At my house it is a privilege for my children to drive a car. But if I get a wild hair, I can take the car keys and there is nothing they can do until I decide to give them that privilege again. I may have a requirement even in order to earn that privilege.
Salvation is a privilege that God gives to those who believe. Thankfully, He doesn't get wild hairs.