If everyone eventually gets to Heaven then this makes Christ’s sacrifice of no effect.
He passed through towns and villages, teaching as he went and making his way to Jerusalem. Someone asked him, “Lord, will only a few people be saved?” He answered them, “Strive to enter through the narrow gate, for many, I tell you, will attempt to enter but will not be strong enough. After the master of the house has arisen and locked the door, then will you stand outside knocking and saying, ‘Lord, open the door for us.’ He will say to you in reply, “I do not know where you are from.’ And you will say, ‘We ate and drank in your company and you taught in our streets.’ Then he will say to you, ‘I do not know where you are from. Depart from me, all you evildoers!’ And there will be wailing and grinding of teeth when you see Abraham, Isaac, and Jacob and all the prophets in the kingdom of God and you yourselves cast out. And people will come from the east and the west and the north and the south and will recline at table in the kingdom of God. For behold, some are last who will be first, and some are first who will be last.” Luke 13:22-30
Fifth Ecumenical Council (Constantinople II) held in 553; From “The Anathematisms of the Emperor Justinian against Origen”:
IX. If anyone says or thinks that the punishment of demons and of impious men is only temporary, and will one day have an end, and that a restoration (apokatastasis) will take place of demons and of impious men, let him be anathema.
Anathema to Origen and to that Adamantius, who set forth these opinions together with his nefarious and execrable and wicked doctrine and to whomsoever there is who thinks thus, or defends these opinions, or in any way hereafter at any time shall presume to protect them.
If your hand or foot causes you to sin, cut it off and cast it from you. It is better for you to enter into life lame or maimed, rather than having two hands or two feet, to be cast into the everlasting fire. (Mt 18:8)
Do you not know that the unrighteous will not inherit the kingdom of God? Do not be deceived. Neither fornicators, nor idolaters, nor adulterers, nor homosexuals, nor sodomites, nor thieves, nor covetous,nor drunkards, nor revilers, nor extortioners will inherit the kingdom of
God (1 Co 6:9)[see also Galatians 5:21]