The prospect of a Greater being that listens, understands and rewards the good follower is comforting for some individuals. I wouldn't call them weak-willed, but rather they turn to this Higher being for the hope of answers and understanding when they come upon something they cannot explain or understand. It gives them hope and belief when the world around them seems bleak.
This reduces the amount of questions that they need to ask, as everything can be directed to the doings of this Greater Authority.

An example would be the origins of the Unverse. A physicist would go from "How the Earth was formed" to the seemingly impossible "What caused the Big Bang?"-ish questions while a firm believer of a god would point everything to his god and say "God created this wonderful world for us".

A good paradox I enjoy asking believers of God is the question, "Then what did God do before he created the Universe?"
And I've gotten all sorts of answers. One was that "God was busy battling Satan with the angels."