As a child is always trying to please their parents so man is always trying to please God.
God is righteous and the only way we can please Him and be in His presence is if we are righteous.
Unrighteousness or “sin” separates us from God.
Ever since the disobedience of Adam and Eve man has been born into sin.
Rom_3:23 For all have sinned, and come short of the glory of God;
The reward for sin is death.
Rom_6:23 For the wages of sin is death; but the gift of God is eternal life through Jesus Christ our Lord.
The only way we can come back to God is by His free gift, His Son, Jesus Christ
Eph 2:8 For by grace are ye saved through faith; and that not of yourselves: it is the gift of God:
Eph 2:9 Not of works, lest any man should boast.
Joh_14:6 Jesus saith unto him, I am the way, the truth, and the life: no man cometh unto the Father, but by me.
There is only one way to God, through Jesus Christ, His Son.
When Jesus died on the cross and shed His blood He become the offering for our sin, as the blood of animals in the past was offered to God to cleanse from sin, so the blood of Jesus become the final offering for us to be cleansed from sin.
To accept the cleansing we first have to accept the fact that we are sinners and that we need to be forgiven. The next step is to repent (turn away) from sin, and ask for forgiveness.
What is sin?
Sin is not the things that we do wrong, they are the fruit of sin, sin is not believing God.
Joh 16:7 Nevertheless I tell you the truth; It is expedient for you that I go away: for if I go not away, the Comforter will not come unto you; but if I depart, I will send him unto you.
Joh 16:8 And when he is come, he will reprove the world of sin, and of righteousness, and of judgment:
Joh 16:9 Of sin, because they believe not on me;
Joh 16:10 Of righteousness, because I go to my Father, and ye see me no more;
Joh 16:11 Of judgment, because the prince of this world is judged.
When we repent of sin we are saying that we believe God. What we believe is shown by our actions in life, the way that we live and talk.
Rom 10:9 That if thou shalt confess with thy mouth the Lord Jesus, and shalt believe in thine heart that God hath raised him from the dead, thou shalt be saved.
Rom 10:10 For with the heart man believeth unto righteousness; and with the mouth confession is made unto salvation.
This is the first step to be born again of the spirit.
Joh 3:3 Jesus answered and said unto him, Verily, verily, I say unto thee, Except a man be born again, he cannot see the kingdom of God.
When we accept Jesus Christ as our personal saviour we become alive in the spirit for we have surrendered our life to Him.
Gal_2:20 I am crucified with Christ: nevertheless I live; yet not I, but Christ liveth in me: and the life which I now live in the flesh I live by the faith of the Son of God, who loved me, and gave himself for me.
God also wants to be with us as we want to be with Him.
Joh 3:16 For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life.
Joh 3:17 For God sent not his Son into the world to condemn the world; but that the world through him might be saved.
Joh 3:18 He that believeth on him is not condemned: but he that believeth not is condemned already, because he hath not believed in the name of the only begotten Son of God.
Once we are born again we become new creations.
2Co_5:17 Therefore if any man be in Christ, he is a new creature: old things are passed away; behold, all things are become new.
We no longer live under the condemnation of sin.
Rom 8:1 There is therefore now no condemnation to them which are in Christ Jesus, who walk not after the flesh, but after the Spirit.
Rom 8:2 For the law of the Spirit of life in Christ Jesus hath made me free from the law of sin and death.
We now live under the law of the spirit.
Rom 8:5 For they that are after the flesh do mind the things of the flesh; but they that are after the Spirit the things of the Spirit.
Rom 8:6 For to be carnally minded is death; but to be spiritually minded is life and peace.
Rom 8:10 And if Christ be in you, the body is dead because of sin; but the Spirit is life because of righteousness.
Rom 8:11 But if the Spirit of him that raised up Jesus from the dead dwell in you, he that raised up Christ from the dead shall also quicken your mortal bodies by his Spirit that dwelleth in you.
We need to be right before God.
Rom 12:1 I beseech you therefore, brethren, by the mercies of God, that ye present your bodies a living sacrifice, holy, acceptable unto God, which is your reasonable service.
Rom 12:2 And be not conformed to this world: but be ye transformed by the renewing of your mind, that ye may prove what is that good, and acceptable, and perfect, will of God.
We renew our mind by reading and studying the word of God, this should start with the basic things and then go on from there.
Heb 5:12 For when for the time ye ought to be teachers, ye have need that one teach you again which be the first principles of the oracles of God; and are become such as have need of milk, and not of strong meat.
Heb 5:13 For every one that useth milk is unskilful in the word of righteousness: for he is a babe.
Heb 5:14 But strong meat belongeth to them that are of full age, even those who by reason of use have their senses exercised to discern both good and evil.
Act_3:19 Repent ye therefore, and be converted, that your sins may be blotted out, when the times of refreshing shall come from the presence of the Lord;