Will religion always exist?

i mean, i can understand the reason for religion thousands of years ago. if you saw a giant bolt of light come out of the sky and burn things, you'd be thinking of divine punishment. but c'mon! we are far more intelligent now and know the reasons for things. will people cling to their thoughts of gods and afterlives/rebirths forever? or will we learn to cherish the one life we KNOW we have?