Do you disagree that there was a universal scope to the atonement? If so, we can certainly walk through the many orthodox Christians throughout history of which you seem unaware.So you have redefined "Atonement" in such a way that no orthodox Christian in history would agree?
You are free to have your own opinions but you are not free to have your own facts.
The above is NOT the theological definition of "Atonement."
I like John Piper, and consider him orthodox. So let's start there (mostly because that is my position - that Christ died to redeem the elect but the cross "makes possible and purchases a bonafide offer for every person on the planet."