Indeed everyone was called but only a few chosen. Only the few who actually and correctly followed Jesus were chosen. And these were just a few. The very great majority bury each other:
Matthew 22:14King James Version (KJV)
14 For many are called, but few are chosen.
Matthew: 8 KJV N.T.
22 But Jesus said unto him, Follow me; and let the dead bury their dead.
Fact is, if you follow Jesus, you must be chosen. However only a few are chosen. Therefore, although a billion people believe they follow Jesus the very great majority of them were deluded.
A billion strong traditional Christian are not a few. This means that they did not follow and are not following Jesus, although they sincerely believe that they are following Jesus. They are the dead who are burying each other.
The billion strong traditional/main stream Christians did not follow Jesus because they are not the chosen few. What then, is their mistake?
Their sad mistake is that they remained O.T./Mosaic/ten commandments people who followed the physical, 'seen' and temporal, son of man Jesus who is not the Lord.
They did not become N.T./spirit and Spirit/Christian people who followed the Spirit, 'not seen' and eternal, Son of God Jesus, who is Lord.
It is very strongly suspected that the Jews misled aspiring Christians, ably assisted by Peter & co. who remained Jews (i.e. O.T./Mosaic/ten commandments subjects and not at all N.T./spirit and Spirit/Christian subjects).
1 Thessalonians: 2 KJV N.T.
14 For ye, brethren, became followers of the churches of God which in Judaea are in Christ Jesus: for ye also have suffered like things of your own countrymen, even as they have of the Jews:
15 Who both killed the Lord Jesus, and their own prophets, and have persecuted us (Christians); and they please not God, and are contrary to all men:
The Jews were the unawares, false spying brethren, mention in:
Galatians: 2 KJV N.T.
4 And that because of false brethren unawares brought in, who came in privily to spy out our liberty which we have in Christ Jesus, that they might bring us into bondage
It is not the fault of the Jews. Fact is, up to this day the billion strong traditional/mainstream Christians are still extremely foolish. They totally ignored the Holy KJV N.T. which confirmed that Christians are totally freed and liberated from bondage under the O.T./Mosaic/ten commandment tradition:
Galatians: 5 King James Version (KJV)
1 Stand fast therefore in the liberty wherewith Christ hath made us free, and be not entangled again with the yoke of bondage.
2 Behold, I Paul say unto you, that if ye be circumcised, Christ shall profit you nothing.
3 For I testify again to every man that is circumcised, that he is a debtor to do the whole law.
4 Christ is become of no effect unto you, whosoever of you are justified by the law; ye are fallen from grace.
Up to this day the billion strong foolish traditional Christians will argue that the bondage mentioned above is not bondage under the O.T./Mosaic/ten commandment tradition.
The following clearly instruct that spiritually aware people transgress the 'thou shall not covet' commandments so as to serve spirit/love unconditionally. Also this revelation confirms that 'the thou shall not covet' commandment, 'killeth. It is the law of sin and death:
Romans: 7 King James Version (KJV)
4 Wherefore, my brethren, ye also are become dead to the law by the body of Christ; that ye should be married to another, even to him who is raised from the dead, that we should bring forth fruit unto God.
5 For when we were in the flesh, the motions of sins, which were by the law, did work in our members to bring forth fruit unto death.
6 But now we are delivered from the law, that being dead wherein we were held; that we should serve in newness of spirit, and not in the oldness of the letter.
7 What shall we say then? Is the law sin? God forbid. Nay, I had not known sin, but by the law: for I had not known lust, except the law had said, Thou shalt not covet.
10 And the commandment, which was ordained to life, I found to be unto death.
The above confirms that the ten commandments are the law of sin and death. Now the following confirm that the law of the Spirit of life in Christ Jesus hath made me free from the law of sin and death:
Romans: 8 KJV N.T.
2 For the law of the Spirit of life in Christ Jesus hath made me free from the law of sin and death.
Clearly the law of the Spirit of life in Christ Jesus makes one free from the ten commandments, including every thing else in the O.T./Mosaic tradition.
. . . throw out the ten commandments and nothing else of substance is left in the O.T./Mosaic tradition.
A billion strong (foolish) traditional/mainstream Christians are esteeming, using, invoking and promoting the O.T./Mosaic/ten commandments. They are clearly not onto to 'the law of the Spirit of life in Christ Jesus'. They are not Christians. They are like Jews who cannot and will not enter heaven.
These billion strong (foolish) traditional/main stream Christians have been seriously misled (by many false prophets who came in Jesus' name).
. . . and they are a billion (not a few) bold and brazed, 'know it all' people.