Get real, heir.
If Paul didn't think that believing is something
we do to get saved then he wouldn't have answered this question the way that he did:
"And brought them out, and said, Sirs, what must I do to be saved? And they said, Believe on the Lord Jesus Christ, and thou shalt be saved, and thy house" (Acts 16:30-31).
If you are right then Paul would have told him,
"You can't do anything to get saved since believing is not something that you can do."
But that is not what Paul told him, is it?