You call yourself an advocate for reason, but from your one statement I do not think you're a doctor and qualified to determine delusions nor understand when comparing to religious experiences. In other words, you're wrong.
Here is an explanation of delusions:
"This entry focuses on the phenomenon of clinical delusions. Although the nature of delusions is controversial, as we shall see, delusions are often characterised as strange beliefs that appear in the context of mental distress. Indeed, clinical delusions are a symptom of psychiatric disorders such as dementia and schizophrenia, and they also characterize delusional disorders. The following case descriptions describe one instance of erotomania, the delusion that one is loved by someone else, often of higher status, and one instance of Cotard delusion, the delusion that one is dead or disembodied."
http://plato.stanford.edu/entries/delusion/
What about religious experiences?
Here is one explanation:
"Religious experiences can be characterized generally as experiences that seem to the person having them to be of some objective reality and to have some religious import. That reality can be an individual, a state of affairs, a fact, or even an absence, depending on the religious tradition the experience is a part of. A wide variety of kinds of experience fall under the general rubric of religious experience. The concept is vague, and the multiplicity of kinds of experiences that fall under it makes it difficult to capture in any general account. Part of that vagueness comes from the term ‘religion,’ which is difficult to define in any way that does not either rule out institutions that clearly are religions, or include terms that can only be understood in the light of a prior understanding of what religions are. Nevertheless, we can make some progress in elucidating the concept by distinguishing it from distinct but related concepts."
http://plato.stanford.edu/entries/religious-experience/