The late, great Baptist preacher, Charles Haddon Spurgeon, said many times concerning the doctrines of free will which are commonly labeled Arminianism, that, “The doctrine of justification itself, as preached by an Arminian, is nothing but the doctrine of salvation by works.” In other words, Spurgeon believed, and quite passionately, that the gospel preached by those who hold that men have a free will that can choose Christ is nothing more than a salvation that is based upon works not upon faith in Christ alone.
Such a charge is not a light charge, for when one takes that which is the Gospel and distorts it into a salvation that is based upon human merit and law-keeping, he does not merely tarnish the Gospel, but he destroys it in its entirety. The apostles, for this reason, speak very harshly concerning those who do thus to the Gospel and admonish the church over and over throughout their letters to watch out for those who distort the Gospel in this way and to cast them out of their fellowship. And to demonstrate this great passion of the apostles for the purity of the Gospel, the apostle Paul speaking to the Galatian church regarding the Judaizers (those who sought to add the work of circumcision to the Gospel), wrote:
You [Galatians] were running well. Who hindered you from obeying the truth? [i.e. The Judaizers did.] This persuasion [of the Judaizers] is not from him [i.e. God] who calls you. A little leaven leavens the whole lump [i.e. a little distortion ruins the whole Gospel]. I have confidence in the Lord that you will take no other view than mine [i.e. the Gospel that I have preached], and the one who is troubling you will bear the penalty, whoever he is. But if I, brothers, still preach circumcision, why am I still being persecuted? In that case the offense of the cross has been removed. I wish those who [Judaizers] who unsettle you would emasculate themselves! (Gal. 5:7-12).
Now, the apostle makes it very clear of how he feels about the Judaizers adding the work of circumcision to the Gospel. He says that their doing thus, first, leavens and destroys the whole Gospel, in that, second, it removes the offense of the cross of Christ thereby demonstrating that it is a false gospel, and, third, that, because of this false teaching, he wishes that they who did this to the Gospel would castrate themselves! In other words, he is saying in not so many words, “I wish that they who wish to cut off the foreskin of your flesh and by it destroy the Gospel would instead keep cutting on their own genitals and leave you and the Gospel alone.”