How does religion help humanity?

I do not agree with religion, because every religion disagrees with every other religion, thus contradicting their own religions. They also do not make sense to me, as all the lessons taught seem to be illogical. HOWEVER, I think that it is great for the people that are part of religions to have something to strive for and believe in. It is much nicer to think that "God wanted your grandfather to die and had a reason for it, and now he is living happily in heaven..." rather than someone just being dead in a hole in the ground.