“So you could conclude that he didn’t actually die for anyone, he potentially died for everyone; in other words, he had sort of a potential atonement that the sinner activates by faith.”Jesus died for everyone, but if you don't accept His offer of Salvation, you don't go to heaven (ergo, you wasted your Salvation).
You were invited to the Party but you refused to go.
There it is.
Which is essentially what Jesus said about the wedding feast.