The Importance of Belief in Hashem

The Ramban enumerated the 613 commandments, and nobody can quite explain why he put them in the order that he did. He began with the commandments to believe in Hashem and to know his unity. Whoever does not believe this denies the very main principle, says Rabbi Shmuley Boteach. "We are duty-bound to be ready to give our life and our might and main for this belief"