Greetings Maximillian,
Currently, from a medical stand point, when a body is frozen, the water in the cells expands and bursts the cell walls. This includes the brain cells. Medicine would have to come up with a way to correct all that damage before they could start the process of repairing whatever killed the person in the first place.
Also from a medical standpoint, current theory is that memory is held in the firing of nurons between synapses. If the bodyis cooled enough, this would stop and by current theory memory would cease.
From a legal standpoint, currently you cannot freeze someone until they are legaly declared dead. If you do it before then, it is called murder.
Now things change. When I was a child, death happened when the heart quit beating, period. The first heart transpland was done on an American citizen by an American doctor in South Africa because if he had done it in the US, the doctor would have been guilty of murder. He had to stop the mans heart to remove it and install the new one.
Also, when I was a child, medicine considered things we do routinely today as fantasy.
Currently, cryogenic hibernation is an expensive burial, but if those who are frozen have the possability of being reawakened, then I would imagine that their sould stays with their body just as it would in an extended coma.
Remember that God is outside of time. He knows if this will happen to a specific individual.
As for the church, it is an expensive burial but currently, that is all it is.
I hope this helps.
Patrick
AMDG