Is it possible to be very intelligent but not spiritually advanced or enlightened?

Intelligence has nothing to do with spiritual enlightenment. Intelligence depends on the thinking mind, which is like a radar system that ensures our survival. As such, it can be frequently alarmed and live in agitation and fear. Spiritual enlightenment does not depend on the mind, logic, or advanced intelligence. It comes from the heart and gut center and not the head.
We have many different kinds of intelligence, which may be debatable:

• Logical-mathematical
• Linguistic
• Spatial
• Musical
• Bodily
• Emotional
• Naturalistic

Our logical-mathematical and linguistic forms of intelligence allow us to communicate our path to enlightenment when we have found it. They also enable us to read books that point the way. But those books are just one way to “get there.” If you can’t read, or even have a below-average IQ, you can still feel at one with the underlying energy flow of the Universe. You may feel it in your bones or through your emotions. Or you may feel the creative forces of nature running through your body.

Sometimes intelligence stands in the way of understanding Source Energy. It wants to dissect, analyze, and prove itself right. It is looking for all the flaws so it can dominate them and protect itself. Very intelligent people can torture themselves endlessly over everything that could go wrong, from cosmic explosions to atomic meltdowns and entropy in interpersonal relationships . Intellectually understanding all the possible consequences of every action can lead to paralysis and incapacitating anxiety.
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Spiritual enlightenment is a state of inner peace. It is not the mind racing around trying to solve every problem in the world or even every personal issue. And there are many paths to this peace. The intellect is not usually one of them. Yet the Stoics and other philosophers are able to use logic to arrive at a sense of resignation to what is, combined with a zest for being alive. However, in general, it is not the head, but the heart that opens the gates to enlightenment.