Well finally there is something we agree on! When a person in this life gets born again there is nothing that can destroy our relationship with god. sin can block our fellowship but not our relationship!
But for the unbeliever who dies in their unbelief:
Matthew 7:23
And then will I profess unto them, I never knew you:
depart from me, ye that work iniquity.
Matthew 25:41
Then shall he say also unto them on the left hand,
Depart from me, ye cursed, into everlasting fire, prepared for the devil and his angels:
John 3:18 King James Version (KJV)
18 He that believeth on him is not condemned: but he that believeth not is condemned already, because he hath not believed in the name of the only begotten Son of God.
John 3:36 King James Version (KJV)
36 He that believeth on the Son hath everlasting life: and he that believeth not the Son shall not see life; but the wrath of God abideth on him.
Revelation 20:13-15 King James Version (KJV)
13 And the sea gave up the dead which were in it; and death and hell delivered up the dead which were in them: and they were judged every man according to their works.
14 And death and hell were cast into the lake of fire. This is the second death.
15 And whosoever was not found written in the book of life was cast into the lake of fire.
For these terrible things that await those who refuse ot receive Christ or do not hear the gospel, that is why we need to heed these two verses:
Matthew 28:19-20 King James Version (KJV)
19 Go ye therefore, and teach all nations, baptizing them in the name of the Father, and of the Son, and of the Holy Ghost:
20 Teaching them to observe all things whatsoever I have commanded you: and, lo, I am with you always, even unto the end of the world. Amen.
Romans 10:12-15 King James Version (KJV)
12 For there is no difference between the Jew and the Greek: for the same Lord over all is rich unto all that call upon him.
13 For whosoever shall call upon the name of the Lord shall be saved.
14 How then shall they call on him in whom they have not believed? and how shall they believe in him of whom they have not heard? and how shall they hear without a preacher?
15 And how shall they preach, except they be sent? as it is written, How beautiful are the feet of them that preach the gospel of peace, and bring glad tidings of good things!
God has ordained the preaching of the good news of Jesus to each and every member of the body! woe unto us if we do not obey our part in that call!