No, NONE of the verses say any of that. What they DO say is that whoever believes HAS eternal life. There was no "caveat" about having to "remain in Chrit and receiving the promise of eternal life "as long as they remain in Christ".
In fact, there is no such wording anywhere in Scripture.
So then, the verses that plainly say that whoever believes HAS (as in currently possesses) eternal life don't really mean that???!!!
The verses are clear enough. They are not about a future "promise" of eternal life, but a direct statement of currently possessing eternal life WHEN one believes.
(God in us and we in God is the wording in these scriptures)
1 John 4:14 And we have seen and do testify that the Father sent the Son
to be the Saviour of the world. 15 Whosoever shall confess that Jesus is the Son of God,
God dwelleth in him, and he in God. 16 And we have known and believed the love that God hath to us. God is love; and he that dwelleth in love dwelleth in God, and God in him.
Whoever believes and bears good fruit has eternal life with the Father when Christ returns. It is a promise of God, but also a promise that those who bear bad fruit or not fruit at all of none of God and will not receive eternal life, but are cast into the fire.
Matthew 7:15 Beware of false prophets, which come to you in sheep's clothing, but inwardly they are ravening wolves. 16 Ye shall know them by their fruits. Do men gather grapes of thorns, or figs of thistles? 17 Even so every good tree bringeth forth good fruit; but a corrupt tree bringeth forth evil fruit. 18 A good tree cannot bring forth evil fruit, neither
can a corrupt tree bring forth good fruit. 19 Every tree that bringeth not forth good fruit is hewn down, and cast into the fire. 20 Wherefore by their fruits ye shall know them.
21 Not every one that saith unto me, Lord, Lord, shall enter into the kingdom of heaven; but he that doeth the will of my Father which is in heaven. 22 Many will say to me in that day, Lord, Lord, have we not prophesied in thy name? and in thy name have cast out devils? and in thy name done many wonderful works? 23 And then will I profess unto them, I never knew you: depart from me, ye that work iniquity.
(God in us and we in God is the wording in these scriptures)
1 John 4:14 And we have seen and do testify that the Father sent the Son
to be the Saviour of the world. 15 Whosoever shall confess that Jesus is the Son of God,
God dwelleth in him, and he in God. 16 And we have known and believed the love that God hath to us. God is love; and he that dwelleth in love dwelleth in God, and God in him.
(none of God will be burned)
John 15:1 I am the true vine, and my Father is the husbandman. 2 Every branch in me that beareth not fruit he taketh away: and every
branch that beareth fruit, he purgeth it, that it may bring forth more fruit. 3 Now ye are clean through the word which I have spoken unto you. 4 Abide in me, and I in you. As the branch cannot bear fruit of itself, except it abide in the vine; no more can ye, except ye abide in me. 5 I am the vine, ye
are the branches: He that abideth in me, and I in him, the same bringeth forth much fruit: for without me ye can do nothing. 6 If a man abide not in me, he is cast forth as a branch, and is withered; and men gather them, and cast
them into the fire, and they are burned.
Romans 8:9 But ye are not in the flesh, but in the Spirit, if so be that the Spirit of God dwell in you. Now if any man have not the Spirit of Christ, he is none of his.