no religion I am aware of has any real official anti-cryonics position yet
I think the actual heuristic used by a minority of them, more than the smaller minority who admit it, is to oppose things unless they are religiously endorsed. For this reason I partially disagree with this select portion of your post. I endorse the rest.
From Mike Darwn's Chronopause, an essay titled "Would You Like Another Plate of This?", discussing people's attitudes to life:
Conclusion, graphs, and references in article. As usual, I recommend reading Chronopause.com as Darwin has many good articles; to quickly link a few: