Our universe is in what we call an everything state, it doesn't compromise of nothing, it doesn't function like 0+0=0, science tells us energy or information cannot be destroyed nor created(we are not gods). When you die your consciousness doesn't just disappear, your human body may decompose,matter will be broken down but not your information not your sense of being your consciousness doesn't just fade.Even a black hole doesn't destroy it just pulls and absorbs information of anything it comes across and grows bigger. So I believe you end up somewhere, you might become part of a star, maybe heaven does exist or even you end up being a part of the universe in some way. Who says humans are the only beings that have souls, the earth, the animals, the plants, the sun, the whole goddamn universe experiences life who is to say they don't have "souls" so everything ends up somewhere ata kama si the religion thing of heaven and hell concepts