The mainstream storyline suggests the inhabitants of Byzantine Sardis were really very “foolish”.
That’s because the Byzantines didn’t build the Sardis Citadel “upon a rock”.
Matthew – Chapter 7
24 Therefore whosoever heareth these sayings of mine, and doeth them, I will liken him unto a wise man, which built his house upon a rock:
25 And the rain descended, and the floods came, and the winds blew, and beat upon that house; and it fell not: for it was founded upon a rock.
26 And every one that heareth these sayings of mine, and doeth them not, shall be likened unto a foolish man, which built his house upon the sand:
27 And the rain descended, and the floods came, and the winds blew, and beat upon that house; and it fell: and great was the fall of it.
King James Bible Online
The majority view among scholars is that Matthew was a product of the last quarter of the 1st century.
Wikipedia – Gospel of Matthew
“Church M” was a small, fourth-century mortuary chapel and the earliest extant Christian church at Sardis built on the abandoned grounds of the Hellenistic Greek Temple of Artemis on the Acropolis.
Wikipedia – Byzantine Churches at Sardis