Jesus taught a message of repentance, forgotten or ignored today. God has historically called for people to repent, to change their lives, to follow him. Peter wrote: 2 Peter 3:9 "The Lord is not slow to fulfill his promise as some count slowness, but is patient toward you, not wishing that any should perish, but that all should reach repentance." On Pentecost Peter told the people: Acts 2:38 "Repent and be baptized every one of you in the name of Jesus Christ for the forgiveness of your sins and you will receive the gift of the Holy Spirit."
Repentance was the most prominent characteristic of the preaching of the prophets. Repentance meant to return to active obedience to the Law of Moses. The standard of repentance was then and is today God's word. Jesus taught: Matthew 4:17 "Repent, for the kingdom of heaven is at hand" and Luke 3:10-14 "'Whoever has two tunics is to share with him who has none, and whoever has food is to do likewise." Tax collectors also came to be baptized and said to him, 'Teacher, what shall we do?' And he said to them, 'Collect no more than you are authorized to do.' Soldiers also asked him, 'And we, what shall we do?' And he said to them, 'Do not extort money from anyone by threats or by false accusation, and be content with your wages.'"
Repentance meant polygamists were called to monogamy, drunkards were called to sobriety, homosexuals were called to behave according to God's law, idolaters were called to worship the true God, those who practiced Judaism were called to submit to the Christ. Repentance meant and means to leave a sinful lifestyle or ungodly religious practices and turn to God and His will. These are not works they are the way one lives their life. Examples in the Bible show one must be able to repent in order to be immersed and receive forgiveness of their sins.
We talk about the symbolism of immersion but one fact remains, examples found in the Bible indicate it is only by being immersed can we receive forgiveness of our sins. It is only by following the Christ that we can be saved. One does not join the church, one does not become Christian when one is immersed for the forgiveness of their sins God adds them to the number previously immersed, the saved. One becom a Christian when they follow the Christ, when they follow the Christ's teachings. As on Pentecost, the question is not how do I join the church or how do I become Christian, it is: Acts 2:37 "when they heard this they were cut to the heart, and said to Peter and the rest of the apostles, "Brothers, what shall we do?" Or as the jailer: Acts 16:29-30 "And the jailer called for lights and rushed in, and trembling with fear he fell down before Paul and Silas. Then he brought them out and said, "Sirs, what must I do to be saved?" As on Pentecost the answer is: Acts 2:38 "And Peter said to them, "Repent and be baptized every one of you in the name of Jesus Christ for the forgiveness of your sins, and you will receive the gift of the Holy Spirit" and as with the jailer: Acts 16:31-33 "'Believe in the Lord Jesus, and you will be saved, you and your household.' And they spoke the word of the Lord to him and to all who were in his house. And he took them the same hour of the night and washed their wounds; and he was baptized at once, he and all his family."
Anything else does not work.
Relying on grace is not enough. Jude 1:4-8 "certain people have crept in unnoticed who long ago were designated for this condemnation, ungodly people, who pervert the grace of our God into sensuality and deny our only Master and Lord, Jesus Christ. Now I want to remind you, although you once fully knew it, that Jesus, who saved a people out of the land of Egypt, afterward destroyed those who did not believe. And the angels who did not stay within their own position of authority, but left their proper dwelling, he has kept in eternal chains under gloomy darkness until the judgment of the great day—just as Sodom and Gomorrah and the surrounding cities, which likewise indulged in sexual immorality and pursued unnatural desire, serve as an example by undergoing a punishment of eternal fire."
While God wants everyone to be saved not all will be. Unless God is willing to do away with the free-will of His creation, some will be lost.