That's a retarded explanation.
Our defined "consciousness" could be gone, but from a purely scientifically view, we just don't go "poof!" upon death. We leave behind the defecation in our fleshy corpses, fresh organs (if you've been living a somewhat decent lifestyle), liters of blood (bad or good), and a really nasty smell for the mortician to deal with.
From there, your body parts could be used for cooking, cremating, ski-ence, or for saving that rotten bastard child that didn't get gutted the right way.
Or you could turn your body into a diamond and dump it in a cave system to grow.
As for the concept of "souls", that shit might as well be disputable, but you can't just go off and say that "WE DISAPPEAR HURRRRR" until it's a fucking fact, aight?
It's like asking if aliens exist when life already exists here. If the consensus of the scientific community agrees on the universe's ever-expanding size, it'd be VERY unlikely life has also got a kickstarter program elswhere.
And if God(s) exists? That's a fucking disputable question. If you know the answer to that, please hand me your Nobel Prize.
And unicorns exist; they're fucking rhinos.