Let’s look at that verse and stop using that like it’s the same as those who “trust on” and “have faith of” Christ.
James 2:19 Thou believest that there is one God; thou doest well: the devils also believe, and tremble.
That’s rather different than this.
Acts 16:31 And they said, Believe on the Lord Jesus Christ, and thou shalt be saved, and thy house.
Nobody was saying that they were the same.
The way that I interpret the verse is that the demons believe because they know that God exists and that Christ is His Messiah.
But it doesn’t follow that they follow Him.