People will always need something to believe. If not, all that is left is an empty hole in the middle of our being, soul, psyche, whatever. Nothing found in these three dimensions (4 if you wanna count time) can ever fill that hole. Not mortal love, not science, not even hatred.
BTW, I dont think hate can be the only true emotion, because without love, there is no hate. Hate comes from pain and suffering (yoda) and replaces what was once loved and now lost. Hate comes from our love being taken or betrayed, etc. Otherwise there would only be apathy.