I just believe that that's it. Game over. You don't think, hear, sense, feel, see, or anything.
Who knows if there is a higher power that exists out there or not. Religion was just basically to set morals/standards for society. The first people on Earth didn't know how anything worked, so they worshiped anything that they didn't know, but was there for some reason, until society started to discover the purpose of natural things and how they came along.
Time moved on, people created more and more concepts of religion to instill fear to keep society structured...until technology and science advanced, and more and more stuff had a logical reason behind it, ex. natural elements, water, weather.
Maybe once you bite the dust, you get your own fantasy land or whatever, maybe with the option to shape it how you want it. No one knows...because no one brought back the declared dead so far.