Lets try to make sense of the madness and confusion
Faith means fidelity, faithfulness, steadfastness, firmness, trust. All of that.
For by grace (thats something God grants) are ye saved, through faith (this is our part) not of works (like the pharisees were claiming in Acts 15:1 works of the law dont justify but faith working by love) lest any man should boast. (Genuine repentance does not cause boasting, but rather humbles us before God).
Disobedience and unbelief are the same thing.
Heb 3:18 And to whom sware he that they should not enter into his rest, but to them that believed not?
Heb 3:19 So we see that they could not enter in because of unbelief.
Obedience and belief are the same thing.
Heb 5:9 And being made perfect, he became the author of eternal salvation unto all them that obey him;
Joh 3:36 He that believeth on the Son hath everlasting life: and he that believeth not the Son shall not see life; but the wrath of God abideth on him.
Read Hebrews 11 for a full break down of what faith is in action.
During the times of Noah when the world was in complete wickedness as it is prophecied to be before the Lord returns, Noah found grace in the eyes of the Lord.
Gen 6:8 But Noah found grace in the eyes of the LORD.
There is the grace part, and here is Noah's faith:
Heb 11:7 By faith Noah, being warned of God of things not seen as yet, moved with fear, prepared an ark to the saving of his house; by the which he condemned the world, and became heir of the righteousness which is by faith.
The example here is clear, Noah was saved by grace, through faith. Thats how the Hebrews understood it, had this happened in 2017 McDriveThrough christianity we would say we're not gonna build no boat, thats works and salvation is not of works, we're just gonna believe. But in reality, not building the boat exhibits LACK OF FAITH!
Read the entire chapter, its filled with similar examples. Another example:
Num 21:8 And the LORD said unto Moses, Make thee a fiery serpent, and set it upon a pole: and it shall come to pass, that every one that is bitten, when he looketh upon it, shall live.
God's grace is being shown above, then by faith people who look at it, shall live. Thats how it happened to Israelites, but had this happened in 2017 McDriveThrough christianity, we would refuse to look at it because we're saved by grace and if we look at it, its works and we're not saved by works. Yet again in this example not looking at the serpent exhibits LACK OF FAITH!