It is true. Everyone somehow needs to believe in something. That is why there are so many cults and religions. I think that thanks to beliefs it is possible to regulate human behavior, if it were not for them, maybe we would not be the people we are today. Good topic.
We don't need to, we want to ;) They make us feel good ;) We wouldn't be doing what we do in large part if some beliefs were gone, and things might be better for it ;)