The Atheists Have a Field Day With This Bahag.
Rabbi Mendel Krasnjanski
Source Sheet Rambam vs bahag if there is a mitzvah to believe in Hashem. Opinions of Sefer Hachinuch, Semag, Semak, Rashi. The Netziv's take The Megillas Esther defends the Rambam The Abarbanel's proof Tzemach Tzedek takes it to a new level.