You are absolutely wrong. Once saved, always saved is the foundation of Christ’s sacrifice for us. Period.
The rest of the NT is a road map to show up how we must continue to grow in our walk with Christ. But it repeatedly reminds us that we cannot earn and we cannot keep our salvation through works, deeds, or beliefs. It was a gift to us that cannot be taken away. By anyone. Including ourselves.
No. Never was, that's a really modern theology and interpretation of Christ's message in Holy Scripture.
we cannot earn and we cannot keep our salvation through works, deeds, or beliefs.
I think what we do shows what we really believe. They're inseparable as Christ taught.
But I'm really surprised you include "beliefs" in your post here.
I thought we would agree on one thing, that "whoever believes in him shall not perish but have eternal life."
In your view, is this not part of "beliefs" ?