Believing in God is not faith in the shed blood of Christ to cleanse us from all sin. That is the whole point of James 2:19.
The Devil absolutely believe that Christ blood can save you too.
There is only one virtue that establishes allegiance and you have not stated it.
1 Corinthians 13
2If I have
the gift of prophecy, and know all mysteries and all knowledge; and if I have all faith, so as to remove mountains, but do not have love, I am nothing.
3And if I give all my possessions to feed
the poor, and if I surrender my body to be burned, but do not have love, it profits me nothing.
You can have ALL FAITH, Omniscient & Omnipotent, If you do not have love it is trash.
I think Only elect are given the GIFT of prophecy, I could be wrong, God given gift, so is faith, knowledge, intelligence etc.
You have a current system that sets up a blanket of "invincible ignorance" where if I do something evil its because "I am only human" because my nature limits me, I don't know how to do good nor know what is right and only to do evil acts. But TRUE EVIL like the Devil absolutely know what is GOOD, know what is the right thing to do, have the capacity to do what is right and absolutely choose to do wrong.
When I sin it is MY FAULT not my nature's fault. I have no excuse at all. When I sin I really did have the option to do what is right with full knowledge it is the right thing to do, with the full capacity to do it.