Food Restrictions/Greek Gods

What is the purpose of not being allowed to eat something on a certain day? What is the purpose of not being allowed to eat something because of the way it was slaughtered? Please enlighten me, who created these rules? What will happen to us if we do not obey them? All of these questions pertain to "God" and the absurdity of "his" existence. Think about it, for Jews, on high holy days; they are not allowed to drive an automobile. Why? Because it says in the Torah not to. Why do we have to listen to the Torah? Because "God" created it. Therefore we should do everything it says, and believe every story it tells. Such as the story of Moses seeing "God" in the state of a burning figure. This reminds me of Greek Mythology. To all religious people; do you realize that the Greeks believed that all of the "Gods" actually existed. How absurd does that sound? They actually believed that Zeus, Dionysis, Hades, Poseidon, Cupid, and all the hundreds of others actually existed! Now, if that seems absurd, than believing in just one "God" has to seem a little absurd. The fact of the matter is, if believing in hundreds of "Gods" sounds absurd, than believing in one "God" is absurd.