Pardon me for being persistent, but...
We have agreed that the material elements of our being will be recycled - here on Earth. We also agree that something returns to the "source".
If we accept both of those premises, we must also agree that there is something non-material in our composition.
I contend that our "soul-consciousness" doesn't actually return to the source (which I call Universal Intelligence or Cosmic Consciousness) but is in constant communication with the source, even if we are not aware of the connection.
In this theory, the material body is merely a vessel for the soul-consciousness for the brief time we spend on this plane. Since the brain is also material, it is not fully aware of the "real" person dwelling inside the body. The brain controls the body, but not the spirit.
One of the problems that arises from the belief that the soul is eternal and is all that survives death, is the issue of moving our thoughts from the brain to the soul. Otherwise, our thoughts would cease when the body and brain die. But, if the soul is in constant contact with the source, the transfer of thoughts would be on-going. Then there would be no need for a heaven, since the channels of communication have always been open and the source does not need the soul to "report back" at the time of material death.
Meanwhile, we all seem to have a desire to get our brain to recognize our real self - our soul. Meditation and contemplation are methods of "soul-searching", aren't they?