[4:159] And there is not one of the People of the Scripture but will assuredly believe in him before his death; and on the Day of Resurrection he will be a witness against them.
Because He ruled that there will be no security (amāna) for them at the time of despair, their faith (īmān) at that time will not benefit them. This tells us that what is taken into consideration comes through the security granted by the Real, not through the faith of the servant.