I think I'm beginning to understand.
However, regarding the quote from the book, it is not that we have not reached the "suprarational stage," it's that it cannot be explained by science. Many times people criticize skeptics for using science because it is "limited to the physical universe."
But science has done so much for us. Through science we have learned so much. Invented so many technologies. Saved so many lives. Science is a reliable tool that has brought us out of the darkness of ignorance. Science is something we have found reliable, and so we trust it.
But it is true, science is limited to our natural world. Then the question is, how do we know there is another universe, or plane, or whatever you think there is beyond our universe? This process you are describing seems to take a large amount of time and effort.
This is where my real criticism comes in; how do we know that the effort is worth it? What you have said is that in order to know that it is worth it, you must first go through the experience. But how do we know that you, and all these other people, have indeed entered, or have started entering, this "suprarational" stage? How do we know that what you have experienced is real and true, without evidence of it? The only reason that seems to be apparent is that you must have faith that it will. Faith that by going through this process you will enter this stage. And faith is counter-intuitive for us, and something we despise. Faith has lead too many people to disaster.
That is the reason why I and many skeptics have refused to do such things. However, I realize that as a human, and due to my biological programming, I may have made an assumption without realizing it, as I have done in the past. Please correct me on any mistakes I made in my reasoning; I would greatly appreciate it.