If the average person is granted the ability to manufacture their own reality without any need for earthy concerns, one might think evolutionary forces would push people into becoming marginally intelligent beings focused on decadence.
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Sexual activity aside, human creative activity did not 'produce beings of greater intelligence'.
That was my point. That there exists a process (evolution) where greater intelligence can spring from lesser intelligence. I agree the mechanism is quite different but it demonstrates there is no fundamental obstacle to the process of increasing intelligence.
Perhaps this is one of the mental leaps that creationists are not able/willing to make. Their belief in an ultimate intelligence producing lesser intelligences is at least logically consistent.