Some Christians are convinced in their own minds that they are a little closer to God than others, like the Pharisee in Luke's gospel.
"The Pharisee, standing, prayed this to himself: "God, I am thanking you that I am not even as the rest of men, rapacious, unjust, adulterers, or even as this tribute collector. I am fasting twice of a sabbath. I am taking tithes from all whatever I am acquiring." (Luke 18:11-12)
The Pharisees considered themselves the most righteous sons of Abraham. So, imagine how they felt when a poor carpenter from Nazareth told them that they were not sons of Abraham, but were sons of the Adversary - Satan.
“You are of your father, the Adversary, and the desires of your father you are wanting to do…He who is of God is hearing God’s declarations. Therefore, you are not hearing, seeing that you are not of God.” (John 8:44-47)
"Thus you, also, outside, indeed, are appearing to men to be just, yet inside you are distended with hypocrisy and lawlessness..." (Matthew 23:28)
"And you invalidate the word of God because of your tradition. Hypocrites! Ideally Isaiah prophesies concerning you, saying...in vain are they revering Me, teaching for teachings the directions of men." (Matthew 15:6-9)
The modern day equivalent would be Jesus entering a Christian church or Jewish synagogue today and telling the preacher, priest, or rabbi that he was a follower of Satan.
The Apostle Paul warns of the false “apostles of Christ” because they would teach about "another Jesus".
“For if, indeed, he who is coming is heralding another Jesus whom we do not herald, or you are obtaining a different spirit, which you did not obtain, or a different gospel, which you do not receive, you are bearing with him ideally….such are false apostles, fraudulent workers, being transfigured into apostles of Christ. And no marvel, for Satan himself is being transfigured into a messenger of light. It is no great thing, then, if his servants also are being transfigured as dispensers of righteousness.” (2 Corinthians 11:4-15)
Paul taught that the real Jesus would save "all mankind" and "reconcile" all creation to God. So, anything less than the salvation and reconciliation of all is a "different evangel" about "another Jesus".
I once read an almost forgotten piece of literature from 1890 written by Thomas Allin entitled “Christ Triumphant” where he speaks of the most egregious false teaching of modern day Christianity.
“The consequences of the false teaching of eternal torment are now the fabric of society...The consequences of the false doctrine of eternal torment are so all pervasive, so closely connected to the invisible and nearly universal undercurrent of human thinking concerning God, that they are impossible now to separate and calculate.”
That was written almost 130 years ago and avoiding eternal torment is still the basis for most Christian evangelism today. Nevertheless, God's teaching of the salvation of all will come to pass rather than the "directions of men" regardless of how many believe those men.
Here is the truth about salvation from the Scripture...
"...through Him (Jesus) to reconcile all to Him (making peace through the blood of His cross), through Him, whether those on earth or those in the heavens. And you, being once estranged and enemies in comprehension, by wicked acts, yet now He reconciles by His body of flesh, through His death, to present you holy and flawless and unimpeachable in His sight." (Colossians 1:20-22)
“I am entreating then, first of all, that petitions, prayers, pleadings, thanksgiving be made for all mankind...for this is ideal and welcome in the sight of our Savior God, Who wills that all mankind be saved, and come into a realization of truth." (1 Timothy 2:1-4)
"For there is one God, and one Mediator of God and mankind, a Man, Christ Jesus, Who is giving Himself a correspondent Ransom for all (the testimony in its own eras)." (1 Timothy 2:5-6)
"Faithful is the saying and worthy of all welcome (for for this are we toiling and being reproached), that we rely on the living God, Who is the Savior of all mankind, especially of believers. These things be charging and teaching.” (1 Timothy 4:9-11)
All other Scripture must be harmonized with the above in a search for truth.