This is the prevailing perception...even among those who believe otherwise. Believing...as distinct from knowing.
Objectively, meaning doesn't exist. However, meaning does exist subjectively, and that is good enough. I recommend viewing the issue from the subjective, first person, ante-mortem perspective.
Well , whatever impressions we make on the medium ( I refer to the 'medium' as whatever we are interacting with. Society, environment and other things) around us stay there as prints even though our exsistence is temporary . Our act of doing or not doing something has an impact on that medium around us and that makes our exsistence meaningful . For instance, Martin Luther King's lifetime work to end racial discrimination against blacks has a profound impact on the lives of african americans living there. The world today as it is , is shaped by those prints . And you too might like to add some of your prints. Please Register or Log in to view the hidden image!
I think belief in the afterlife devalues life and cheapens the now factor or dulls the experience. And makes mankind dumber for believing the bullshit. Living is the only way you can give meaning to anything, survival is the driving force. Death brings about immediacy to action. Purpose is what you make of it. Consuming more than you need with out giving back to the earth is parisitism. What type of organism do you want to be, a parasitic leach or a flying bird or the fruit of knowledge or human the creator.
A cookie is meaningful - before it is eaten. Once eaten, the abstraction of a cookie retains meaning, since cookies can be replenished. Enjoy your own temporary residence in the cookie-jar, whilst you can: Nature has the insatiable munchies.