... "Why is quantum mechanics being appealed to / jumbled-up beyond recognition in religious discussions across the web?"
I'll try to answer that:
The quasi-simultaneous appearance of a flood of misunderstood QM terms and concepts here and in other forums, such as: Measurement of distributed entangled mixed states suggest relativity’s speed of light limit is wrong (EPR Paradox), “observation” is what collapses the (mixed state) wave function, David Bolm's version of QM blurs past and future,suggesting a great unity, Schroedinger's Cat show QM applies to the macro world, Wave/particle duality show QM is wrong, uncertainty principle means science itself admits its truth is false , etc. clearly is an orchestrated drive by scientifically ignorant network of agents, trying to show that science supports not only belief in God but the Christian version of that!
I have actually done QM calculation, (even a few in the original matrix form) and know this flood of pseudo QM for what it is: Re-posts of some notes provided somewhere that the poster barely if at all understands. When clarified for them, they just move on and start a new thread – not interested in learning any QM, only wanting to show it endorses the Christian POV ( not re-incarnation or any other)
I have actually read at least the first 30 or so pages of Descartes'
Discourse on the Method many years ago, in English translation. His famous phrase: Cogito ergo sum appears in the first few pages as I recall. Then from this base, by about page 23 as I recall, he has “logically derived” that Christ had to die on the cross (or some way) to save the true believers from their inherited “original sin.” I stopped reading that religiously biased philosophial trash soon after reading that.
With his analytic geometry Descartes made a great advance but as a philosopher he is nuts – can't even see that it is his indoctrinate beliefs that are guiding his silly "logic."
SUMMARY: This just shows that once even a great mind gets well indoctrinated with the Christian religious POV, it lose the ability to think about / accept evidence/ that contradicts that POV. Why the Jesuits say: "Give me a child until he is five, and I'll give you a Catholic for life."