@Cathode is right.
Faith is a word that for some people often means just adhering to a creed, having a set of beliefs, an acceptance of a doctrine. Head knowledge.
“I agree that Jesus died for my sins and rose again from the dead.”
Then they add a bunch of other dogma, based on their denomination, and this results in them thinking they are saved Christians going to heaven. They wear a cross necklace, delight in church, and read devout books.
Meanwhile, they may be strict morally and feel proud — or they might pamper the flesh, view adult entertainment, get drunk or stoned, chase money, use cuss words, drive over the speed limit, gossip, never help the poor, look lewdly upon women, commit fornication or adultery, watch horror films, lie about stuff, cheat on taxes, steal, gamble, engage in gluttony, fight in wars, envy more successful people, covet things, enjoy worldly music, play violent video games, etc.
To give mental assent to spiritual statements, without acting on them, without actually obeying God and imitating Jesus, is a dead faith, which does not save anyone.
Genuine faith is verified by godly works. A good tree cannot produce bad fruit and a bad tree cannot produce good fruit.