Whenever anyone brings into “grace” the works of the law there is a nullifying of grace (Romans 11:6) or as Galatians 5:4 says “… ye are fallen from grace.”
Anyone who has first trusted in the gospel of grace to save them, they are saved but drawn away from the doctrine that not only saves, but also empowers the Christian life. Galatians 3:1-3 “O foolish Galatians … Are ye so foolish? having begun in the Spirit, are ye now made perfect by the flesh?”
But if someone did not get saved by the gospel of grace and from the beginning thought that a work was necessary for salvation, those have never been saved. Since only God knows the heart, he would be the only one who knows for sure if they are saved. We can only ask them. And if their words do not match the gospel of grace we could never be sure if they were ever saved. The Apostle Paul had this fear towards some in Galatia. We see this in Galatians 4:9 where he writes: “But now, after that ye have known God, or rather are known of God…” As if he is not sure they do know God. Again in Galatians 4:11 “I am afraid of you, lest I have bestowed upon you labour in vain.”
The one thing for sure is that Paul did not consider the doctrine of Judizers as truth, nor of them as saved brethren. He calls them “false brethren” in Galatians 4:4.
So your confusion is shared by all who know the grace of God. If anyone adds works of the law to grace that frustrates the grace of God and brings in confusion.
We are a Grace organization proclaiming the salvation by grace through faith in finished work of Jesus Christ in the cross of Calvary.