You cannot disprove the fact that "Easter" in Acts 12:4 is a goof; therefore the KJV isn't the WHOLE, UNADULTERATED word of God. It has man-made additions & changes not found in its sources. Acts 12:4 is just one of many. You're stuck with that fact, and therefore wanna change the subject.
My means for the study of the scriptures has included word studies and cross referencing and comparisons. It has led to many revelations that I would not have learned otherwise. That which I have shared about "the word of the LORD" in Ge 15 is one example. I have also learned much about the ways of God and how he presents many truths 3 times in the scriptures as his way of putting his trinitarian signature on the whole thing. Things like baptizing the nation of Israel in water 3 times throughout their history, or saying that each member of the Godhead raised Jesus from the dead or that there are three phases in the resurrection of the dead, the first fruits, the main harvest, and the gleanings, yet it is one resurrection, the first resurrection. That each member of the Godhead is said to indwell the believer in Jesus Christ, The Father in 2 Cor 6;16, The Son in Eph 3:17, and the Spirit in Rom 8:11.One can go on and on with examples.
One of the ways of God is similitudes.
Ho 12:10 I have also spoken by the prophets, and I have multiplied visions, and used similitudes, by the ministry of the prophets.
In the cross references of Acts 12:4 one cannot miss the similitudes that the comparisons reveal. Here are the cross references of this verse from the KJV. Your Bible will probably not cross to the same passages but it is interesting that the KJV crosses to Esther where we have a similar story of a wicked ruler and a man of God and a first month Nissan when the Jewish Passover took place and the death of the wicked ruler and a pretty girl and a miraculous deliverance of the man of God.
It could be, and probably is, you who are missing the spiritual lesson God is teaching by including this story in his holy Scriptures.
Ac 12:4 And when he had apprehended him, he put him in prison, and delivered him to four quaternions of soldiers to keep him; intending after Easter to bring him forth to the people.
Mt 27:65 Pilate said unto them, Ye have a watch: go your way, make it as sure as ye can.
Mt 27:66 So they went, and made the sepulchre sure, sealing the stone, and setting a watch.
Ac 4:28 For to do whatsoever thy hand and thy counsel determined before to be done.
Es 3:6 And he thought scorn to lay hands on Mordecai alone; for they had shewed him the people of Mordecai: wherefore Haman sought to destroy all the Jews that were throughout the whole kingdom of Ahasuerus, even the people of Mordecai.
Es 3:7 In the first month, that is, the month Nisan, in the twelfth year of king Ahasuerus, they cast Pur, that is, the lot, before Haman from day to day, and from month to month, to the twelfth month, that is, the month Adar.
Es 3:13 And the letters were sent by posts into all the king’s provinces, to destroy, to kill, and to cause to perish, all Jews, both young and old, little children and women, in one day, even upon the thirteenth day of the twelfth month, which is the month Adar, and to take the spoil of them for a prey.
Pr 19:21 There are many devices in a man’s heart; nevertheless the counsel of the LORD, that shall stand.
Pr 27:1 Boast not thyself of to morrow; for thou knowest not what a day may bring forth.
La 3:37 Who is he that saith, and it cometh to pass, when the Lord commandeth it not?
Mt 26:5 But they said, Not on the feast day, lest there be an uproar among the people.
The program I used to cross reference was the on-line Bible.
The feast of Purim began as a result of Esther's delivering the Jews.
The month Adar, the 12th month means "glorious."
Acts 12:20 And Herod was highly displeased with them of Tyre and Sidon: but they came with one accord to him, and, having made Blastus the king’s chamberlain their friend, desired peace; because their country was nourished by the king’s country.
21 And upon a set day
Herod, arrayed in royal apparel, sat upon his throne, and made an oration unto them.
22 And the people gave a shout, saying, It is the voice of a god, and not of a man.
23 And immediately the angel of
the Lord smote him, because he gave not God the glory: and he was eaten of worms, and gave up the ghost.
24 But the word of God grew and multiplied.
25 And Barnabas and Saul returned from Jerusalem, when they had fulfilled their ministry, and took with them John, whose surname was Mark.
Barnabas and Saul were in Jerusalem or at least in the area when James was killed by Herod.
Acts 11:27 And in these days came prophets from Jerusalem unto Antioch.
28 And there stood up one of them named Agabus, and signified by the Spirit that there should be great dearth throughout all the world: which came to pass in the days of Claudius Caesar.
29 Then the disciples, every man according to his ability, determined to send relief unto the brethren which dwelt in Judaea:
30 Which also they did, and sent it to the elders by the hands of Barnabas and Saul.
Acts 12:11 Now about that time Herod the king stretched forth his hands to vex certain of the church.
2 And he killed James the brother of John with the sword.
3 And because he saw it pleased the Jews, he proceeded further to take Peter also. (Then were the days of unleavened bread.)
4 And when he had apprehended him, he put him in prison, and delivered him to four quaternions of soldiers to keep him; intending after Easter to bring him forth to the people.
It seems to me that Herod thought the preachers of Christ were a threat to the Jewish religion. It seems that God wanted this incident to cross to the book of Esther where we learn of the feast of Purim.