We can not deceive God, and it is useless to deceive ourselves or others. "The Lord seeth not as man seeth; for man looketh on the outward appearance, but the Lord looketh on the heart." 1 Sam. 16:7. The circumcision in which the "false brethren" were seeking to induce the Galatians to trust, meant self-righteousness, instead of righteousness by faith. They had the law only as "the form of righteousness and of truth." With their works they could make "a fair show in the flesh," but it was only an empty show; there was no reality in it.
If you had the choice to learn about justification and sanctification, would you dart off to the popular churches of today to study under them or would you inquire of the Lord and His word and search the writings of the prophets - both old and recent? -D. Peters