I find this argument really bizarre. In my experience, genuinely spiritual people have no interest in talking about creationism because it is irrelevant to their faith.
Many people have had supernatural experiences and their faith is based on that. Obviously if you have had such experiences, trying to make up some strange explanation of the earth becomes 5,000 years old is an utter triviality.
I think it is somewhat irrelevant whether or not these supernatural experiences are based on having a lot of imagination or real supernatural entities. What is relevant is that people go out and have personal experiences of the supernatural.
People who go on about creationism to convince themselves there is a god are like teenagers who try to tell you about sex because they once kissed the back of their hand but have never had a boyfriend.