It seems as though your crisis of religion has been solved.
How can it be achieved? Psychotropic drugs, virtual reality, mind control, or whatever sci-fi method you like.
They can transplant arms from a cadaver and have them fully functional.
There are simple tricks you can do to people to make them think something is occurring when it is not. Like rubbing their hand, while they are looking at a fake hand being rubbed, then stab the fake hand type stuff. There's augmented reality. You can mess with a person's equilibrium, sensory perception, whatever.
I'm still not sure of what you want here, it seems like you are against believing in this, yet say it makes you question your faith?
Are you trolling?
Oh, also, people who are quadriplegic and can only move their head, or in some cases only eyes, well they have been testing technology for a long time with good results of people being able to control their environment with such limitations. The next logical step would be to have they, themselves believe it was real. This is where the drugs come into it.