Direct Answer
Bercot warns that some “Bible-believing” Protestants can resemble the Gnostic instinct when, reacting against Roman Catholic abuses, they refuse to believe God can use physical creation (bread, wine, water) as a real means of grace and reduce communion to “nothing but a symbol.” This overreaction pushes salvation and God’s work into an “all spiritual plane” that rejects material channels.
Support from Transcript:
Where do you see your church assuming that if something involves physical matter it must be superstition? How can you reject Roman Catholic abuses without rejecting the idea that God works through His creation?