The same kind Paul is - the works of love. And the difference is that the real faith produces loving behavior. He has three ways of describing this counterfeit faith. It is dead faith. There is a faith that even devils have, namely, belief in right doctrine.
Devils can be orthodox at the intellectual level.
But it doesn't save them. So there is dead faith and devil faith. So there is useless, idle, ineffective, vain, empty faith. Well, he does it like this. He takes two events in the life of Abraham.