Not only do I disagree with you but nearly every single civilization or populous of people from the beginning of recorded history, and perhaps even beyond, all had an inherent notion of a after life. And that is not even taking in to the account of any religious or philosophical persuasions that have come about. That in and of itself is reason to 'suspect'. As far as belief, that I leave up to the individual. If you chose to believe or not, I am ok with that, but to outright discard any reason to suspect is just foolish in my humble opinion.
Either way, you need to live (and die) with yourself so what you chose to believe is just fine with me. I can tell you this though, if I were arrogant enough to think that every civilizations of people to ever come before me were just stupid or crazy, and have the audacity to discard any and all spiritual reasoning without benefit, then I too would perhaps take your stance.