Salvation is for those who believe in Jesus.
John 3:16
Whosoever believe.
Believing in Christ is Romans 10:9-10. It is believing all that scripture says about Him. This belief is only created in the heart by the Holy Spirit through the hearing of Gods word. You can only come to Christ as God draws you. Mercifully God draws all men to Christ.
John 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.
8 And when he is come, he will reprove the world of sin, and of righteousness, and of judgment:
9 Of sin, because they believe not on me;
10 Of righteousness, because I go to my Father, and ye see me no more;
11 Of judgment, because the prince of this world is judged.
12 I have yet many things to say unto you, but ye cannot bear them now.
13 Howbeit when he, the Spirit of truth, is come, he will guide you into all truth: for he shall not speak of himself; but whatsoever he shall hear, that shall he speak: and he will shew you things to come.
14 He shall glorify me: for he shall receive of mine, and shall shew it unto you.
15 All things that the Father hath are mine: therefore said I, that he shall take of mine, and shall shew it unto you.
The heart that has been convicted of sin, righteousness, and judgment by the Holy Spirit cannot ever recant. The problem today is that modern evangelism has never allowed folks to get good and lost before they have them get saved. Modern evangelism is more concerned about crowds of people that even a single soul becoming a genuine Christian.
For the cause of Christ
Roger