That is, if the word "religion" is used in anything like the way normal people use it, which is belief in supernatural entities that involve claims about the history of things, proscriptions about behavioral dictates, and degrees of veneration or worship.

Add language and written messages to the mix and you get an even more interesting process. We humans can achieve an "immortality" quite independent of death, cellular or multicellular.

That absolute belief is, as always, open to new evidence. But I'm not holding my breath that such evidence will appear, so my provisional absolute remains such.

There is no way for religion to disappear because it comes from the way our brains function.

Is it in the rule book that the universe itself cannot be (wink at Aristotle) an Uncaused Cause?

We humans crave explaining things, and we are naturally drawn to inventing supernatural explanations for things we didn't understand.