Can you fool people into thinking you're a Christian by keeping the law?

Les explains that while law keeping may fool people into thinking someone is a Christian, it never fools God, because the book says no man is justified by the law in the sight of God. The law is not of faith; the man who does them must live in them. If a person wants to keep the Law for salvation, he must keep it to the last iota. That would require a temple, the priesthood, and the sacrifice, and even then they could not accomplish it because it is impossible. A relatively new believer noted that keeping the Sabbath and the Law would require a temple, a priest, and a herd of sheep, and Les agreed that if you are going to keep the Law, you must keep it all.