Drug induced, fear induced, sleep-deprived induced, what have you...If a person experiences a "spiritual" moment, to and for them, that moment was experienced, and is therefore valid.
I've had plenty of "spiritual" experiences in my life, some major, and some more minor in nature, some drug induced, while most have not been.
When I was 11 I went to the Grand Canyon for a camping trip, and was blown away by its enormity and beauty, so much so I began to cry. Needless to say, I was *not* intoxicated then.
When I was 17 I was in Hawaii, and I met the most fantastic guy with whom I really connected to, and one day we spent the entire afternoon walking around a Chinese cemetery and made out *inside* of a banyon tree, it was the first time I had ever connected with a guy, and I would definitely classify it as a "spiritual" experience.
That same trip, I tried MDMA for the first time, and for the first time in my then 17 years of life, I had actually bonded with my sister who at the time I more or less *hated*. That night marks a pivotal moment not only in my life, but in what would become our new founded relationship as sisters. Was it drug induced? Yes. Does that matter?? No.
I have had psilocybin induced "spiritual" experieces as well, one time I was tripping with my best friend in an old cemetery in Boulder, Colorado. It was a beautiful crisp spring night, and we were laying on the grass looking at the stars, I recall being overwhelmed by the seemingly inherent wonder and beauty within and amongst nature, and there was nothing "fake" or "phony" about this experience.
Honestly, I can list twenty more non-drug induced such moments, but I'll spare your eyes.
If you experience a moment of wonder, regardless of why or how, that moment is real, and should be regarded as such.