Name three.
DR.E: We believe and are saved by grace through faith, both of which are unseen but real.
WAGGLEBEE: The Gospels and early chapters of Acts demonstrate that this was not always the case.
You'll note I said "we." Not the apostles and the hundreds of disciples who also received the grace to believe.
But even those believers were saved by unseen faith. Plenty of people witnessed the miracles of Christ and did not believe. Something else was going on other than mere sight of actual events.
It's called "grace."
Yet some did not believe UNTIL they saw:
Jesus therefore said to him: Unless you see signs and wonders, you believe not. (John 4:48)