I'm "Calvinist" and never became one by reading a bunch of "dead guys" so I never got it from reading Calvin or any other Reformed books. Wait, never mind, you're right, I did. I read it in Scripture. One of them actually rose from the dead, and he's alive!
Unsubstantiated broad brushing. Also, anything you offer is now only your opinion on Scripture. Not exegesis, not proper interpretation, just plain opinion. Just leveling the playing field.
Ah, there you go. It's apples and oranges, and doesn't make your case unless your case was to call others just merely religious, namely Calvinists. I bet that's it right there, I mean why else make the comparison? Right?
Yes, we rely on Scripture for certain, and in Paul's magnum opus, Romans 9 is one of the heavy hitters.
But, let's not be disingenuous my friend.
This doctrine is taught throughout Scripture and can be proven elsewhere because God being immutable has always saved this way.
But I digress, I've not witnessed even one anti-Calvinist properly interpret Romans 9. It is always done in an anti-election free will mindset. All it proves is the person has a serious issue with God's decree to elect and save whom he wills. That said, please note this attitude described in Romans 9:20. God has it handled, all of it. Soli Deo Gloria!