> As it stands today, cryonics is an act of faith, not science.

Current cryonics is perhaps too crude to work, or you can cast doubt on the long-term sustainability of the organizations, or whatever, but that doesn't make it an act of "faith", at least not any religious sense.

It's an act of decision making under some very big uncertainties, but it's not unscientific. If you accept the physicalist tenet that the brain is a machine, that the mind is the result of information processing, that there is no unmaterial "ghost" an so on then trying to preserve the "state variables" of that meat computer with vitrification is perfectly reasonable, specially compared with the only current alternative, total annihilation.