Yeah! I guess they were trying to follow Jesus's example:
Mathew 7:22: Many will tell me in that day, ‘Lord, Lord, didn’t we prophesy in your name, in your name cast out demons, and in your name do many mighty works?’ 7:23 Then I will tell them, ‘I never knew you. Depart from me, you who work iniquity.’
Likewise, no doubt those "foolish" ones who were the object of Paul's rebuke and correction (because of their dispensational beliefs also thought they were "being persecuted for righteousness sake".
Moses or Christ -The Apostle Paul's Reply To Dispensational Error
"To whom we gave place by subjection, no, not for an hour, that the truth of the gospel might continue with you" (Gal. 2:5).
He who would understand the prophets had better begin with Paul's Epistle to the Galatians, where he will find that the Church is one in the Old Testament and New, and the New Testament Church is the fulfillment of all prophecy, the very last phase of God's redemptive work on earth.
He will discover in Galatians who the true Israel is, to whom the promises are made and that there is no other Israel, and no further fulfillment of prophecy.
"O foolish Galatians! Who hath bewitched you" (Gal. 3:1). In Paul's day men came from Judea to Galatia teaching that God had set aside neither the Jewish nation nor Jewish privilege, and unless the Gentiles became as Jews they could not be saved. They even insisted that Gentiles become circumcised as Jews. Against this Paul thundered,"I testify again to every man that is circumcised that he is a debtor to do the whole law, Christ is become of no effect unto you, whosoever of you are justified by the law; ye are fallen from grace" (Gal. 5:3-4).
In chapters 3 and 4, The first great conclusion Paul presents to the Galatians is that the only true children of Abraham, the heirs to the Abrahamic covenant, blessing and promise, are true believers, whether Jew or Gentile: "Know ye therefore that they which be of faith, the same are the children of Abraham" (Gal. 3:7).
There can be no appeal from this fundamental statement. In one sentence Paul destroys the entire dispensational, pre-millennial and post-millennial edifice.
"If ye be Christ's, then are ye Abraham's seed and heirs according to the promise" (v.29).
This one sentence is the death-knell of that dispensational heresy which has filled the Church with the rubbish of a dismantled legalism and aims to reimpose in an age yet to come all those temporalities and restrictions which Christ died once and for all to abolish.
"But when the fulness of the time was come, God sent forth His Son, made of a woman, made under the law, to redeem them that were under the law, that we might receive the adoption of sons" (Gal. 4:4-5).
"The fulness of the time" means the times of prophetical fulfillment of all the purposes and promises of God in redemption. That Paul should call the gospel times "the fulness of the time" means that the gospel age is the age of fulfillment of all things which God spake by His holy prophets since the world began-Luke 1:70.
These are "the last days" described by Paul in Hebrews 1:2, "the end of the world" (Heb. 9:26), "the last time" (1 John 2:18). If these are the last days and the last time, and the end of the world, how say the dispensationalists that there is a "time" after "the last time," another kingdom to come after the "kingdom of God" has run its course, another age after the gospel age?
In this "fulness of time" God's Son was sent forth, born of the virgin, born under the law, that as One obliged by His true humanity and the time at which He appeared, to keep the whole law, did so in the perfection of His mediatorial office, redeeming "those who were under the law" that they with us Gentiles might receive together that "adoption of sons" which sets us beyond the servitude of the law and introduces us to the full inheritance of the sons of God. "And because ye are sons, God hath sent forth the Spirit of His Son into your hearts crying Abba, Father" (v.6).
"God forbid that I should glory, save in the cross of our Lord Jesus Christ, by whom the world is crucified unto me and I unto the world. For in Christ Jesus neither circumcision availeth anything nor uncircumcision, but a new creature. And as many as walk according to this rule, peace be on them, and mercy, and upon the Israel of God." (Gal. 6:14-16).