129,584
Yeah, that's a common critique. The thing is, your soul is separate from your mind and body; your body is physical and the vessel that you use to navigate and experience the world, and to a degree, your current mind is influenced by your body, too. When you die and you lose your body, human mind goes with it, and all that's left is what your soul experiences; but that's still you, as in, the essence that comprises your unique being. So, from there, it becomes a question of which part you consider integral to identity. The form of you? The idea of you? Or the manifestation of you? When someone undergoes amnesia or severe psychosis, and they become an entirely different person, would you say that, since they're something else, they are a new individual altogether? Or are they still the same individual?
In Heaven, you don't just fulfill yourself; you transcend yourself and rise past it. So, from there, it's just a question of what kind of existential nature you want for the part of yourself that survives into the afterlife.
Not trying to proselytize here by the way, I'm not a Christian, and I don't even believe in soul that strongly. Just trying to represent the theology in good faith.