Have you never read what Jesus says in John 16?
Nevertheless I tell you the truth: It is to your advantage that I go away, for if I don’t go away, the Counselor won’t come to you. But if I go, I will send him to you.
8 When he has come, he will CONVICT the world about sin, about righteousness, and about judgment;
9 about sin, because they don’t believe in me;
10 about righteousness, because I am going to my Father, and you won’t see me any more;
11 about judgment, because the prince of this world has been judged.
The Bible also says, "For I am not ashamed of the
Good News of Christ, because
it is the power of God for salvation for everyone who believes, for the Jew first, and also for the Greek" (Romans 1:16)
Jesus again Commanded that we must preach in the Gospel:
"and that
repentance for forgiveness of sins should be
preached in His Name to all the nations, beginning at Jerusalem" (Luke 24:47)
The first sermon ever preached in the Church, was by Peter on the Day of Pentecost
After which we have the reaction by some who heard this message:
"Now when they heard [this], they were
pricked in their heart (CONVICTED by the Holy Spirit), and said unto Peter and the rest of the apostles, Brethren,
what shall we DO?
38 And Peter [said] unto them,
Repent ye, and be baptized every one of you in the name of Jesus Christ
unto the remission of your sins; and ye shall receive the gift of the Holy Spirit.
39 For to you is the promise, and to your children, and to all that are afar off, [even] as many as the Lord our God shall call unto him" (Acts 2)
ALL sinners MUST "repent ye, and believe in the gospel", Jesus' first words in Mark's Gospel, BEFORE they can get saved.
The older Reformed theologians belived this, as did their "Confessions". It is only recently that this has changed