God surprised a lot of people with the New Testament. 
People today are still unwilling to accept it. 

Is the New Testament the completion of God's Word, or is there more to come? 
If there were, would you believe it? 
What would it take to make you believe?

True, as you say, God may have surprised a lot of people with the result of Christ’s ministry—namely, a lot of Jews—but it was not for any oversight or attempt to “pull a fast one” on God’s part. His plan for a new covenant with a spiritual Israel had been clearly declared.

JEREMIAH 31:31 "Behold, days are coming," declares the Lord, "when I will make a new covenant with the house of Israel and with the house of Judah,
JEREMIAH 31:32 not like the covenant which I made with their fathers in the day I took them by the hand to bring them out of the land of Egypt, My covenant which they broke, although I was a husband to them," declares the Lord.
JEREMIAH 31:33 "But this is the covenant which I will make with the house of Israel after those days," declares the Lord, "I will put My law within them, and on their heart I will write it; and I will be their God, and they shall be My people.
JEREMIAH 31:34 "And they shall not teach again, each man his neighbor and each man his brother, saying, 'Know the Lord,' for they shall all know Me, from the least of them to the greatest of them," declares the Lord, "for I will forgive their iniquity, and their sin I will remember no more."

It is true that not all of the details of God’s plan had been revealed, but the groundwork (“I will make a new covenant”) had been set forth. Christ came to begin fleshing out the details of God’s plan, and His coming is a matter clearly and specifically stated in the Old Covenant—Matthew’s gospel is written based upon this thesis.

Those who would be “the Israel of God” (Gal. 6:16) were always meant to be His in heart—the new covenant is extended to those—whether Jew or Gentile—whose hearts are given to God. See Psalm 73:1, Isaiah 45:25, Hosea 1:10, Matthew 3:8-10, John 1:47, Romans 2:28 & 9:6-8, and Galatians 3:7-9 & 6:16. In the days of its founding, Christianity was argued and proven by the apostles from the text of the Old Testament in conjunction with signs and wonders.

The Bible as the word of God is comprehensive. Its parts are complimentary and its content is complete and final.

GALATIANS 1:6  I am amazed that you are so quickly deserting Him who called you by the grace of Christ, for a different gospel;
GALATIANS 1:7 which is really not another; only there are some who are disturbing you, and want to distort the gospel of Christ.
GALATIANS 1:8 But even though we, or an angel from heaven, should preach to you a gospel contrary to that which we have preached to you, let him be accursed.
GALATIANS 1:9 As we have said before, so I say again now, if any man is preaching to you a gospel contrary to that which you received, let him be accursed.

In order for me to accept “another gospel,” I would have to reject and/or contradict the one previously given. I COULD NOT accept another testament, even if it were proclaimed by an angel come down from Heaven. Why such stubbornness? I already have everything by which to be equipped for salvation, through what God revealed to the apostles through His Son (John 16:4, 12-14; Hebrews 1:1-2).

2 TIMOTHY 3:16 All Scripture is inspired by God and profitable for teaching, for reproof, for correction, for training in righteousness;
2 TIMOTHY 3:17 that the man of God may be adequate [lit.,“complete, perfect”], equipped for every good work.

1 PETER 1:23 for you have been born again not of seed which is perishable but imperishable, that is, through the living and abiding word of God.

2 PETER 1:3 seeing that His divine power has granted to us everything pertaining to life and godliness, through the true knowledge of Him who called us by His own glory and excellence.
2 PETER 1:16 For we did not follow cleverly devised tales when we made known to you the power and coming of our Lord Jesus Christ, but we were eyewitnesses of His majesty [thus, fully qualified to write of it].

JUDE 1:3  Beloved, while I was making every effort to write you about our common salvation, I felt the necessity to write to you appealing that you contend earnestly for the faith which was once for all delivered to the saints.
[“The faith” = the gospel, see Paul’s use in Gal. 1:23. “Once for all” translates the Greek hapax, “once for all time.” It is used “of what is so done as to be of perpetual validity and never need repetition” (J.H. Thayer, Greek-English Lexicon of the New Testament, p. 54).]

Hebrews 1:1-2 makes clear God’s mode of revelation in this age by contrasting with His revelatory methods in the past—namely, by way of prophets through dreams, visions, etc. NOW, He speaks to us through His Son, who has chosen to reveal His will by way of the New Testament. We do not NEED anything new, improved, or different. That is the assurance that Christians rest upon—the finality of the covenant Christ died to establish—the New Covenant. Christ offered Himself as a sacrifice “once for all [there it is again]” (Heb. 7:27). To accept the idea that there needs to be MORE is to contradict the message of the New Testament. The book of Hebrews was written to affirm this truth (See 8:6, 13; 9:15, 16, 26, 27, 28; 10:10, 26).

As if its completeness were not reason enough to not accept another, we are specifically warned against such—because, as you know, MANY other and different gospels have come along through the ages—this was known and forewarned of.

1 TIMOTHY 1:3  As I urged you upon my departure for Macedonia, remain on at Ephesus, in order that you may instruct certain men not to teach strange doctrines [“other doctrines,” “different doctrine”],
1 TIMOTHY 1:4 nor to pay attention to myths and endless genealogies, which give rise to mere speculation rather than furthering the administration of God which is by faith.

2 JOHN 1:9 Anyone who goes too far and does not abide in the teaching of Christ, does not have God; the one who abides in the teaching, he has both the Father and the Son.

John, the last living inspired writer, closed out his last work, and the last work of the Canon, with this injunction:

REVELATION 22:18 I testify to everyone who hears the words of the prophecy of this book: if anyone adds to them, God shall add to him the plagues which are written in this book;
REVELATION 22:19 and if anyone takes away from the words of the book of this prophecy, God shall take away his part from the tree of life and from the holy city, which are written in this book.

But, as you say “People today are still unwilling to accept it.” That is true, but the problem lies not in the message or lack of proof to support it, but in the WILL that is unwilling; that is something God will not interfere with—man’s free will. The written word is valid—it is historic, credible, and complete. A rich man suffering in Hades once asked Abraham that a man he knew—a one-time beggar then reclining with Abraham on the side of Paradise--do his family a special favor:

LUKE 16:27 "And he said, 'Then I beg you, Father, that you send him to my father's house--
LUKE 16:28 for I have five brothers-- that he may warn them, lest they also come to this place of torment.'
LUKE 16:29 "But Abraham said, 'They have Moses and the Prophets; let them hear them.'
LUKE 16:30 "But he said, 'No, Father Abraham, but if someone goes to them from the dead, they will repent!'
LUKE 16:31 "But he said to him, 'If they do not listen to Moses and the Prophets, neither will they be persuaded if someone rises from the dead.'"

The proof’s in the pudding, as they say. No other document has stood up over such a long time under such close scrutiny and criticism. Its testimony is as valid today as ever, even though it comes in a book instead of through angels.

If another revelation is needed, then this previous revelation is unjust, unrighteous, and untrue. The New Testament really painted itself into a corner with this one! These guys must have been serious about what they were talking about! The same is true for Jesus’ Lordship. Many who do not want to accept Him as their King will simply say that Jesus was a good man, or perhaps a prophet of God. This compromise cannot be so. Given His own claims ("I am the way, and the truth, and the life; no one comes to the Father, but through Me,” John 14:6), He must be what He claimed to be—the Son of God—or He was either a liar or a lunatic. Our gospel rests on a firm foundation of tried and proven absolutes, and that foundation is not lacking in any of its parts.

Sadly but inevitably, God is going to surprise a lot more people with His next revelation—the Judgment. But, again, it will not be for lack of their opportunity to have known better.

MATTHEW 7:21 "Not everyone who says to Me, 'Lord, Lord,' will enter the kingdom of heaven; but he who does the will of My Father who is in heaven.
MATTHEW 7:22 "Many will say to Me on that day, 'Lord, Lord, did we not prophesy in Your name, and in Your name cast out demons, and in Your name perform many miracles?'
MATTHEW 7:23 "And then I will declare to them, 'I never knew you; depart from Me, you who practice lawlessness.'

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