I believe there may be something after life. Science doesn't, and will never know everything there is to know. Not too long ago the earth was flat and the center of the universe, yet today we know thats not the case. Theres no telling what we'll know tomorrow. Perhaps the "afterlife" is just another universe our consciousness passes in to after our death.
As for the religions such as Christianity, Islam and Judaism, thats a different story. Is there a "God"? Perhaps. But I don't think he sees humans as importantly as we see ourselves. If a God does exist, my belief is that he sparked the big bang and let everything take its own course from there. And if there is a God then it raises the question of what created God? If the universe needed a creator, why doesn't the creator need a creator as well? But back to those three religions, I believe that most, if not all, of what is in their teachings are not to be taken literally as the word of God. I think most of it was written as a way of shaping society as the writers saw fit. Some of it is just plain false, other parts are stretched truths. But certain things such as views on homosexuality or women are clearly things put in by men who thought a certain way.