Hebrews 11:6 But without faith it is impossible to please him: for he that cometh to God must believe that he is, and that he is a rewarder of them that diligently seek him.
Using Strong’s Concordance
Faith <4102> pistis; from <3982> peitho - persuade
Translated in the King James Version – ‘faith’ 239 times, ‘assurance’ 1 time, ‘believe + 1537’ 1 time, ‘belief’ 1 time, ‘them that believe’ 1 time, ‘fidelity’ 1 time.
1) conviction of the truth of anything, belief; in the NT of a conviction or belief respecting man’s relationship to God and divine things, generally with the included idea of trust and holy fervour born of faith and joined with it
1a) relating to God
1a1) the conviction that God exists and is the creator and ruler of all things, the provider and bestower of eternal salvation through Christ
1b) relating to Christ
1b1) a strong and welcome conviction or belief that Jesus is the Messiah, through whom we obtain eternal salvation in the kingdom of God
1c) the religious beliefs of Christians
1d) belief with the predominate idea of trust (or confidence) whether in God or in Christ, springing from faith in the same
2) fidelity, faithfulness
2a) the character of one who can be relied on
Faith is fundamentally the belief that what God has promised he will fulfil. Moreover, faith is demonstrated by what we do because of what we believe.
Specifically, faith is the belief of the gospel preached by Jesus Christ and his apostles.
That Jesus Christ lived a sinless life and submitted it in sacrifice so that the sins of the faithful can be forgiven and they can be raised to eternal life in the kingdom of God when Christ returns.
The Law given through Moses, when God made a Covenant with Israel at Sinai, serves to convict all men (and women) of sin, because none other than Jesus Christ can keep it.
The punishment for unforgiven sin is eternal death.
Ezekiel 18:20 The soul that sinneth, it shall die.
Romans 6:23 For the wages of sin is death;
Salvation is offered through faith in the gospel of Jesus Christ and cannot be obtained by obeying the Law given through Moses.
Acts 13:39 And by him all that believe are justified from all things, from which ye could not be justified by the law of Moses.
Romans 3:20 Therefore by the deeds of the law there shall no flesh be justified in his sight: for by the law is the knowledge of sin. 21 But now the righteousness of God without the law is manifested, being witnessed by the law and the prophets; 22 Even the righteousness of God which is by faith of Jesus Christ unto all and upon all them that believe: for there is no difference: 23 For all have sinned, and come short of the glory of God; 24 Being justified freely by his grace through the redemption that is in Christ Jesus: 25 Whom God hath set forth to be a propitiation through faith in his blood, to declare his righteousness for the remission of sins that are past, through the forbearance of God; 26 To declare, I say, at this time his righteousness: that he might be just, and the justifier of him which believeth in Jesus. 27 Where is boasting then? It is excluded. By what law? of works? Nay: but by the law of faith. 28 Therefore we conclude that a man is justified by faith without the deeds of the law. 29 Is he the God of the Jews only? is he not also of the Gentiles? Yes, of the Gentiles also: 30 Seeing it is one God, which shall justify the circumcision by faith, and uncircumcision through faith. 31 Do we then make void the law through faith? God forbid: yea, we establish the law.
There must be however works associated with faith.
James 1:22 But be ye doers of the word, and not hearers only, deceiving your own selves.
James 2:20 But wilt thou know, O vain man, that faith without works is dead? 21 Was not Abraham our father justified by works, when he had offered Isaac his son upon the altar? 22 Seest thou how faith wrought with his works, and by works was faith made perfect? 23 And the scripture was fulfilled which saith, Abraham believed God, and it was imputed unto him for righteousness: and he was called the Friend of God. 24 Ye see then how that by works a man is justified, and not by faith only. 25 Likewise also was not Rahab the harlot justified by works, when she had received the messengers, and had sent them out another way? 26 For as the body without the spirit is dead, so faith without works is dead also.
Belief of the gospel requires works.
Acts 2:37 Now when they heard this, they were pricked in their heart, and said unto Peter and to the rest of the apostles, Men and brethren, what shall we do? 38 Then Peter said unto them, Repent, and be baptized every one of you in the name of Jesus Christ for the remission of sins,
Following repentance and baptism by immersion in water for the remission of our past sins, we must live a new life by the commandments of Christ.
Romans 6:4 Therefore we are buried with him by baptism into death: that like as Christ was raised up from the dead by the glory of the Father, even so we also should walk in newness of life.
John 15:13 Greater love hath no man than this, that a man lay down his life for his friends. 14 Ye are my friends, if ye do whatsoever I command you.
Living by the commandments of Christ demonstrates our faith.
Luke 6:46 And why call ye me, Lord, Lord, and do not the things which I say? 47 Whosoever cometh to me, and heareth my sayings, and doeth them, I will shew you to whom he is like: 48 He is like a man which built an house, and digged deep, and laid the foundation on a rock: and when the flood arose, the stream beat vehemently upon that house, and could not shake it: for it was founded upon a rock. 49 But he that heareth, and doeth not, is like a man that without a foundation built an house upon the earth; against which the stream did beat vehemently, and immediately it fell; and the ruin of that house was great.
After baptism we will still sin, but provided we are making a determined effort to live by Christ’s commandments, our sin will be forgiven by confession in prayer.
1 John 1:7 But if we walk in the light, as he is in the light, we have fellowship one with another, and the blood of Jesus Christ his Son cleanseth us from all sin. 8 If we say that we have no sin, we deceive ourselves, and the truth is not in us. 9 If we confess our sins, he is faithful and just to forgive us our sins, and to cleanse us from all unrighteousness.
At the judgment it is our faith which will be counted for righteousness
Romans 4:3 For what saith the scripture? Abraham believed God, and it was counted unto him for righteousness… 23 Now it was not written for his sake alone, that it was imputed to him; 24 But for us also, to whom it shall be imputed, if we believe on him that raised up Jesus our Lord from the dead; 25 Who was delivered for our offences, and was raised again for our justification.
Romans 3:30 Seeing it is one God, which shall justify the circumcision by faith, and uncircumcision through faith.
I hope you find this helpful.