Salvation "in Christ"
Romans 10:9-10: "....if you confess with your mouth Jesus as Lord, and believe in your heart that God raised Him from the dead,you will be saved;for with the a person believes, resulting in righteousness,and with the mouth he confesses resulting in salvation."
What Does the Bible Say About Salvation? How Do We Get "into Christ"?
Believe
Mark 16:16: "He who has believed and has been baptized shall be saved; but he who has disbelieved shall be condemned."
Belief, or "faith," must come from the Word of truth, the Bible. And how will one know of the truth outside of the Scriptures or one bringing him or her the Gospel from the revealed Word of God (Rom. 10:14-15)? They Cannot! Rom 10:17: "So faith comes from hearing, and hearing by the word of Christ."
Acts 18:8: "And Crispus, the leader of the synagogue, believed in the Lord with all his household, and many of the Corinthians when they heard were believing and being baptized."
Repent
Mark 16:16: "He who has believed and has been baptized shall be saved; but he who has disbelieved shall be condemned."
Acts 17:30: "Therefore having overlooked the times of ignorance, God is now declaring to men that all everywhere should repent."
Acts 26:20: Paul told "both to those of Damascus first, and also at Jerusalem and then throughout all the region of Judea, and even to the Gentiles, that they should repent and turn to God, performing deeds appropriate to repentance." Repentance involves "turning" from sin, and "turning" toward God. It involves "turning" our life over to God and offering ourselves to Him!
Confess
Rom 10:9-10 tells us that, "if you confess with your mouth Jesus as Lord, and believe in your heart that God raised Him from the dead, you shall be saved; 10 for with the heart man believes, resulting in righteousness, and with the mouth he confesses, resulting in salvation."
Matthew 10:32,33: "Therefore everyone who confesses Me before men, I will also confess him before My Father who is in heaven. But whoever denies Me before men, I will also deny him before My Father who is in heaven."
In "confessing" Christ, we acknowledge our faith in Him as the Messiah, the Son of God, the One who can and will save us from our sins, and He who is Lord. When Peter made that confession in Matthew 16, He knew just who Jesus was! "He said to them, "But who do you say that I am?" 16 And Simon Peter answered and said, "Thou art the Christ, the Son of the living God." 17 And Jesus answered and said to him, "Blessed are you, Simon Barjona, because flesh and blood did not reveal this to you, but My Father who is in heaven" (Matt 16:15-17).
Be Immersed for the forgiveness of sins & the gift of the Holy Spirit
In "confessing" Christ, we acknowledge our faith in Him as the Messiah, the Son of God, the One who can and will save us from our sins, and He who is Lord. When Peter Acts 2:38: "......,Repent, and each of you be baptized in the name of Jesus Christ for the forgiveness of your sins; and you will receive the gift of the Holy Spirit."
Acts 22:16: "'And now why do you delay? Arise, and be baptized, and wash away your sins, calling on His name.'"
Gal 3:27: "For all of you who were baptized into Christ have clothed yourselves with Christ."
Peter writes about "the days of Noah, during the construction of the ark, in which a few, that is, eight persons, were brought safely through the water. 21 And corresponding to that, baptism now saves you-- not the removal of dirt from the flesh, but an appeal to God for a good conscience-- through the resurrection of Jesus Christ, 22 who is at the right hand of God, having gone into heaven, after angels and authorities and powers had been subjected to Him" (1 Peter 3:20-22). Baptism certainly is involved in our salvation, since it is for the forgiveness of sins, and Peter says that it "saves us." Above we see that Paul told the Galatians that this is how they got "into Christ."
Be faithful
unto death
Revelation 2:10: "...Be faithful until death and I will give you the crown of life."
Rom 6:12-13: "Therefore do not let sin reign in your mortal body that you should obey its lusts, 13 and do not go on presenting the members of your body to sin as instruments of unrighteousness; but present yourselves to God as those alive from the dead, and your members as instruments of righteousness to God."