"No one goes to heaven who was saved before "paul" taught a different gospel!" says MAD-ists.
This teaching is not Christian doctrine, this is just MAD-ist doctrine!
Jesus promised to come get His believers to take them to Himself, that where He is, they wil be also [John 14:1-], forever; and He is with the Father in the heavens -particularly seated on Mount Zion above, since His ascension [Psalm 2] where He led all the captives of the first death to, who were held in hell below, where they waited for the promised redemption, who had died in righteousness.
The Scriptures teach the regenerating and unitiing of heaven and earth, from which heavens earth has been quarantined since the fall of "Adam, son of God" -Luke 3:38.
And we aren't saved by "doctrine", but by the personal Savior, who is the "Gospel" =Good News =Glad Tidings, to all nations, Himself.
Mat 5:12 Rejoice, and be exceeding glad: for great [is]
your reward in heaven: for so persecuted they the prophets which were before you.
Mat 6:20 But lay up for yourselves treasures in heaven, where neither moth nor rust doth corrupt, and where thieves do not break through nor steal:
Mat 7:21 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.
Mat 8:11 And I say unto you, That
many shall come from the east and west, and shall sit down with Abraham, and Isaac, and Jacob, in the kingdom of heaven.
Mat 22:30 For in the resurrection they neither marry, nor are given in marriage, but are as the angels of God in
heaven.
Luk 10:20 Notwithstanding in this rejoice not, that the spirits are subject unto you; but rather rejoice, because your names are written in heaven.
Hbr 12:22
But ye are come unto mount Sion, and unto the city of the living God, the heavenly Jerusalem, and to an innumerable company of angels,Hbr 12:23
To the general assembly and church of the firstborn, which are written in heaven, and to God the Judge of all, and to the spirits of just men made perfect,
Act 7:55 But he, being full of the Holy Ghost, looked up stedfastly
into heaven, and saw the glory of God, and Jesus standing on the right hand of God,
Act 7:56
And said, Behold, I see the heavens opened, and the Son of man standing on the right hand of God....
Act 7:59
And they stoned Stephen, calling upon [God], and saying,
Lord Jesus, receive my spirit.
Jhn 14:1¶Let not your heart be troubled: ye believe in God, believe also in me.
Jhn 14:2
In my Father's house [heaven] are many dwelling places: if [it were] not [so], I would have told you. I go to prepare a place for you.Jhn 14:3
And if I go and prepare a place for you, I will come again, and receive you unto myself; that where I am, [there] ye may be also.
MAD is false doctrine by denying the heavenly hope of all Believers.
Jhn 14:20
At that day ye shall know that I [am] in my Father, and ye in me, and I in you.
Jhn 14:28
Ye have heard how I said unto you, I go away, and come [again] unto you. If ye loved me, ye would rejoice, because I said, I go unto the Father: for my Father is greater than I.