You've misstated this continually. Let's try for a final clarification.
God's gift of faith in Jesus Christ is not simply the knowledge that Christ is Lord. It is the understanding that Christ is the Saviour.
Do you know any fallen angels or demons who believe Christ is their Saviour?
Me, either.
The knowledge that Christ is Lord should be evident to every created creature in the world. It is self-evident.
But the understanding that Christ is the Saviour who alone paid for every one of the sins of His flock is not so common. It is only held by those to whom God has given new eyes and new ears and a new heart with which to understand and be grateful for the fact that Christ is their Saviour.
No demon, no fallen angel, no Satan believes Christ is their Redeemer.
Hope this helps your misunderstanding of God's word and promise.
But to him that worketh not, but believeth on him that justifieth the ungodly, his faith is counted for righteousness." -- Romans 4:4-5"Now to him that worketh is the reward not reckoned of grace, but of debt.
Do you understand what Paul is telling you? Are you saved by debt or grace?
Good works are the evidence of God's grace; not a requirement for it.