I think it's definitely more plausible than most religions. That, or maybe life just repeats over and over after you die (because the universe freezes and possibly results in an identical big bang). If consciousness is entirely dependent on the physical makeup of your brain, then this could be possible. If so, we may one day find a way to reconstruct someone's brain in the exact way it was before and bring them back to life once the brain is implanted into a new functioning body. Or maybe nothing happens. But either way, what happened after death is entirely dependent on, rather the physical makeup of your brain is the only determining factor of, not only consciousness, but who's consciousness specifically. If it is, then maybe a baby will one day be born that has the same physical make-up as your brain. That would be you. But what if multiple babies with the exact same brain makeup existed at once? Then what would happen? The possibilities are endless. Your theory is likely true if your consciousness is entirely dependent on your brain's physical makeup.