Why would you go to Heaven when you die?

This might be confusing but this is just something I thought of. Everyone agrees we live in the 3rd dimension. If you take time (or duration) as the 4th (as stated in the 10 dimensions explained video) then when you die, wouldn't your time in the 3rd dimension be done? We are 3rd dimensional figures traveling through the 4th, or time, and when we die or "end" it makes sense to me that our time is done in the 3rd dimension, whether we move up or cease to exist. Since religion is based on a 3 dimensional place you go to when you die, why would you end in the 3rd dimension just to go back there in a different form. That also seems nearly impossible you'd end in this one just to come back differently.