If Saul wasn't qualified to practice law he never would have passed the bar. Period. Once you get that permission to practice whatever you make of it is up to you. Graduating a prestigious firm might give you a head start, but it doesn't guarantee a win.
And no, the law is not sacred. It's a collection of do's and don'ts that define acceptable behavior. It changes almost daily depending on who can make the most convincing arguments, win the most votes, etc.
Consider the Volstead Act for instance. Here was a law that banned alcohol across the entire country and even became a constitutional amendment. Then, after millions of deaths, millions of criminalized citizens, millions of dollars wasted on a hopeless effort it got repealed ten years later.
This was a law that was asked for by a powerful fringe group and poorly drafted by a bunch of Chucks. Does that sound sacred to you?