Bullet points from today's Gospel in the NO.

Those who believe in Christ, have life everlasting-which is the promise of salvation and eternal life with God in heaven;
Those who do not believe, will not get to heaven; all people are given sufficient grace for salvation, remember.
Not only do those who do not believe in Christ not see eternal life in heaven, but they are punished. The wrath of God, rather than the Trinity, dwells within.
From Romans 1:18 on the wrath of God:
Romans 1:18Douay-Rheims

18 For the wrath of God is revealed from heaven against all ungodliness and injustice of those men that detain the truth of God in injustice.
Ungodliness is sin, which stops the truth from being seen; an injustice against God and man.
Hard but true words from the beloved apostle.

John 3:36 Douay-Rheims

36 He that believeth in the Son, hath life everlasting; but he that believeth not the Son, shall not see life; but the wrath of God abideth on him.