This isn't about Jesus Christ, and it isn't about schizophrenia. It isn't even about religion. It's about the Simulation Argument.
Well what it's about is obviously open to interpretation. But I do think there is a distinction between "Am I in the Matrix?" and "Am I insane?" For one thing, we KNOW (or do we?) that there are a lot of people out there who suffer from big-time delusions. There isn't the same certainty about the existence of simulations.
For another, suppose you are presented with compelling evidence that you are in a simulation. e.g. the simulator shows up; tells you that's it a simulation; defies the laws of physics; and gives you some "cheat codes" which seem to work reliably. In that case, a reasonable person would update the probability that he is in a simulation to make it a good deal higher. Unless of course he seriously doubted his sanity. So the question of sanity would seem even more fundamental than the simulation question.
A reasonable person would update both the probability that he is in a simulation and the probability that he is insane to be a good deal higher, at the expense of the hypothesis "I am sane and not in a simulation". That fact probably wouldn't be changed much if he doubted his sanity already.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.