You believe there is one God? the demons also believe and tremble (James 2:19).

What makes our belief different from theirs ?

I like Cardinal John Henry Newman's thinking about faith. He speaks of it as an assent of both the intellect and will: belief with the mind, and surrender to the implications of this belief with the will.

It's the latter part that the demons are missing.

......and perhaps us humans should do a bit more trembling.

Wopik:

Are you suggesting fear and trembling of the Rudolph Otto variety, as in "awe" leading to loving worship of the Creator, or the kind of servile fear that children display when cowering before an abusive parent?

Just the Deuteronomy kind of "fear" - awe.