In Saya's eyes, there is a difference between abnormals and the paranormal. Paranormal events cannot be explained by normal means whereas abnormals already have an explanation but no one really knows everything due to the rainbow spectrum. Think of it like mental health. We know it is there but the information we know changes all the time. One of the reasons he made the paranormal club was so he could conduct his own research into the matter. (See his personality section!)