Instead of attacking their error and combating it with hard argument, the apostle begins with an experience, which illustrates the case in hand. In this narrative he shows that salvation is wholly by faith for all men alike, and not in any degree by works. As Christ tasted death for every man, so every man who is saved must have Christ's personal experience of death and resurrection and life. Christ in the flesh does what the law cannot do. Galatians 2:21; Romans 8:3,4
The letter to the Galatians was called out because the churchmembers were being taught that faith in Jesus wasn't enough, so it was necessary for them to add their own efforts to ensure their salvation. As it was then, so it is today.
"If Christ is not accepted as a complete Savior; He is not accepted at all." E. J. Waggoner