As an atheist, I personally believe that all post-death rituals are for the living and not for the dead. What happens to my body after I die is really not up to me. It's up to my loved ones. I've discussed it with the people closest to me and they know that my personal preference is cremation after any usable organs have been harvested for donation. I have, however, made it perfectly clear to them that they are to do whatever they feel is best that will help them through the grieving process. If they want to bury me and visit my grave for years, they can do that. If they want to follow my preference and scatter my ashes to the four winds, that's equally cool. And if they decide to donate my body to science, they can do that too. It won't make any difference to me when I'm dead.