I too have been questioning the existence of an afterlife, but I have also been questioning the possibility of god. I dont know why because life has been good lately, but for some reason I have been suffering a tremendous lack of faith. Its also wierd, because all my life I have been raised Catholic and I used to go to church often. But lately when the family goes, I always reply "no thanks." To answer your question, no, I do not believe in heaven and hell