Seriously, your 'soul' is the software model your brain hardware maintains and runs.
It is not likely to be immortal: Brain destroyed, soul destroyed.
Great catalogs of brain injuries and the effects on the victims' 'souls' exist.
It's pretty fucking hard to believe a 'soul' is immortal after someone has a stroke and gets demented and seriously disabled, and watching them suffer on and on for years.
The more important question for 'soul' believers is, say a child at a tender age gets his/her head caved in and survives, brutally, horribly handicapped, learning disabled, barely enough animal instinct left to be able to feed him/herself. This person lives to be 60.
Which version goes to 'heaven'? The damaged, barely animal soul that lived out that whole, wretched life being restrained, or the original child? When was the backup snapshot taken?
The child? Is that fair to the barking mad adult who lived 50+ years as a drooling veggie?
The veggie? Would an eternity in 'heaven' as a drooling, barking mad veggie be nice?