If there is one constant of reality and the universe, that constant is change. Everything undergoes change and transformation, restructuring and recycling into something else. Everything. Reincarnation, if you will. Everything always gets disassembled and stuffed into something else. As far as I'm concerned, reincarnation is a fact of how reality and the universe operates. It's the water cycle, the soil cycle, the nitrogen cycle, the web of life, all of it - all reused and recycled in the constantly, eternally changing reality.
Half the point of the classical monotheist conception of god is to stand in stark contrast to the ephemeral and constantly changing nature of everything - it is the beyond everything and the blueprint or mathematical equation maker that is eternal and unchanging. Not really my thing as far as god-concepts go, but I get the appeal. Eastern religions have a similar concept in moksha, or liberation from that one constant of reality that is constant change and being endlessly recycled. Also not really my thing, but I get the appeal.