I wouldn't pick schizophrenia as a base-rate.
As far as I know, schizophrenics are usually aware of their unusual mental/epistemological status, so your thinking yourself normal (as I assume you do) screens off schizophrenia; another issue with schizophrenia is that I've read that schizophrenic hallucination are almost always confined to one modality - you hear someone behind you but if you look you see nothing, I imagine is how it works - so here too you would become aware of glitches or inconsistencies in your senses.
What you want is the situation where you are unaware of any issues and have an issue; which is where confabulating comes in handy, because some of them are just like that and will confabulate that they're not confabulating.
How much confidence do you place in the scientific theory that ordinary matter is made of discrete units, or 'atoms', as opposed to being infinitely divisible?
More than 50%? 90%? 99%? 99.9%? 99.99%? 99.999%? More? If so, how much more? (If describing your answer in percentages is cumbersome, then feel free to use the logarithmic scale of decibans, where 10 decibans corresponds to 90% confidence, 20 to 99%, 30 to 99.9%, etc.)
This question freely acknowledges that there are aspects of physics which the atomic theory does not directly cover, such as conditions of extremely high energy. This question is primarily concerned with that portion of physics in which the atomic theory makes testable predictions.
This question also freely acknowledges that its current phrasing and presentation may not be the best possible to elicit answers from the LessWrong community, and will be happy to accept suggestions for improvement.
Edit: By 'atomic theory', this question refers to the century-plus-old theory. A reasonably accurate rewording is: "Do you believe 'H2O' is a meaningful description of water?".