Luke 12:5 - But I will forewarn you whom ye shall fear: Fear him, which after he hath killed hath power to cast into hell; yea, I say unto you, Fear him.

God should be feared. He made man, and He has the power to not only kill man but to cast him into hell. Unfortunately, anyone who does not accept Christ's payment for sin will spend eternity in hell. That is something to fear!