Jesus Christ came to the earth for the sole purpose of offering man an opportunity to have his sins remitted and enjoying eternity in heaven with the Godhead. No other reason. He fulfilled his duties and set the stage for his inspired apostles to open the doors to his kingdom, his church, his body. The church he had them set up and start, is a spiritual body of believers, a spiritual kingdom, not of this world. (John 18:36 KJV)
After Jesus was crucified and had risen from the grave he told his disciples:
"And Jesus came and spake unto them, saying, All power is given unto me in heaven and in earth. Go ye therefore, and teach all nations, baptizing them in the name of the Father, and of the Son, and of the Holy Ghost: Teaching them to observe all things whatsoever I have commanded you: and, lo, I am with you alway, even unto the end of the world. Amen." (Matthew 28:18-20 KJV)
Paul writes concerning the subject of 'being in Christ' and note that he makes it understood that God was in Christ, and the righteousness of God is in Christ:
"Wherefore henceforth know we no man after the flesh: yea, though we have known Christ after the flesh, yet now henceforth know we him no more. Therefore if any man be in Christ, he is a new creature: old things are passed away; behold, all things are become new. And all things are of God, who hath reconciled us to himself by Jesus Christ, and hath given to us the ministry of reconciliation; To wit, that God was in Christ, reconciling the world unto himself, not imputing their trespasses unto them; and hath committed unto us the word of reconciliation. Now then we are ambassadors for Christ, as though God did beseech you by us: we pray you in Christ's stead, be ye reconciled to God. For he hath made him to be sin for us, who knew no sin; that we might be made the righteousness of God in him." (2 Corinthians 5:16-21 KJV)
Read that passage very thoughtfully and carefully. You will see that, once you have obeyed the requirements to have your sins forgiven, you will be added spiritually to his body, his church, his kingdom...to him. Another scripture assures us we have redemption in his blood, in him:
"In whom we have redemption through his blood, the forgiveness of sins, according to the riches of his grace;" (Ephesians 1:7 KJV)
You see, Christ dwells in us, as does the Holy Spirit, by his word, which the Holy Spirit gave us via the inspired writers. By this means, he dwells in us and we, in turn dwell in him. Notice that all spiritual blessings are in Christ. Not most of them or some of them, but all. Salvation is one blessing and it is in Christ. Read this:
"Blessed be the God and Father of our Lord Jesus Christ, who hath blessed us with all spiritual blessings in heavenly places in Christ:" (Ephesians 1:3 KJV)
"Therefore I endure all things for the elect's sakes, that they may also obtain the salvation which is in Christ Jesus with eternal glory." (2 Timothy 2:10 KJV)
Another powerful scripture is found in Colossians, read and meditate upon this:
"Giving thanks unto the Father, which hath made us meet to be partakers of the inheritance of the saints in light: Who hath delivered us from the power of darkness, and hath translated us into the kingdom of his dear Son: In whom we have redemption through his blood, even the forgiveness of sins: Who is the image of the invisible God, the firstborn of every creature:" (Colossians 1:12-15 KJV)
Whenever one is in Christ, he is in Christ's church, his kingdom, his body. All have reference to the same thing, the spiritual haven found only in Jesus Christ. When we are born a new creature through scriptural baptism, we are added to the family of God and, our past sins are forgiven and we are children of God, brethren of Jesus Christ via adoption.
Today is the day of salvation.