"I do not believe that science can disprove the existence of God; I think that is impossible. And if it is impossible, is not a belief in science and in a God -- an ordinary God of religion -- a consistent possibility?" Thus spoke Richard Feynman, in agreement with other notable scientific minds, including Carl Sagan and Albert Einstein.
In other words, if we cannot conclude that God exists, but we also cannot conclude that God does not. There are indeed multiple possibilities of what happens to consciousness when we die. That is the idea of possibilianism, an idea recently popularized by David Eagleman. We may go to heaven or we all may just be sims. Neither of these possibilities can be proven or disproven, so we cannot discount them 100 percent.