Sarkus said:
Where belief is based purely on subjective experience then it is the interpretation of that subjective experience that is open to question and where the irrationality (if any exists) will lie.
For example - in the absence of evidence other than subjective experience - why would someone interpret something as a ghost, rather than explore the possibility that it was something for which evidence currently exists?
It is irrational, in this instance, to interpret the subjective experience as a ghost unless you first discount every other alternative.
Given the irrational interpretation - any subsequent beliefs based on these interpretations, no matter how rational with respect to those underlying interpretations, must themselves be flawed - and the whole basis of the belief deemed irrational.
In order to come to the conclusion that the ultimate belief is NOT irrational, you would also have to demonstrate that the supporting interpretations are also NOT irrational.
Remember, however, that "irrational" merely describes the process of reaching the end result. You can sometimes reach the right answer through illogical and irrational means. Just don't expect others to follow (or understand) your journey!
I think you make a very good point Sarkus, that it is the process of interpretation of evidence to form a belief that is irrational or rational.
The ghost example is also an interesting one. Ghosts
may exist, we do not know, however they currently lie outside the accepted "methodological materialist" paradigm of science. So someone's personal experience which legitimately convinces them, can only be anecdotal evidence to us. In talking of ghosts, we are still speaking of hypothetical phenomena in the material world, which will require material evidence to become accepted by scientists. Acceptance would entail a huge paradigm shift for science.
Religious experience is not something of the material world at all, and therefore the scientific method for evaluating evidence does not work. We cannot seek "material evidence" of God, subject to peer review in the same way as we can for ghosts. Therefore we can only form our beliefs through a
rational process based on the evidence of our own or other people's subjective experiences. What those experiences are and the framework of assumptions we apply (e.g. materialism, dualism, idealism etc.) will mean we all end up with different beliefs. That is OK, and is what we expect to find among equally logical, rational people.
Much more interesting for me therefore, is "what is the way to the good life?", which is why the Greeks first started philosophy, but which has become neglected in modern philosophy. I became a theist because I believe it holds out more hope, but I realise it's a problem we are all trying to solve.
Sarkus said:
And in this instance would also be correctly deemed delusional.
I'm pleased we agree!