I'm responding as a Catholic. It sounds to me like you're reaching for meaning where there is none. As for actual Biblical references, I'm pretty sure I haven't come across any synaesthetic references specifically. As to the second part of the question, I'm not sure what you are asking.
Synaesthesia can be a blessing or a disability depending on the individual's experience with synaesthesia. Some people with music-->sight synaesthesia do consider it a disability, though because it's so strong that they cannot do things like drive when music is on. As for me, once I discovered that not everybody saw music, I considered it a blessing.
It may be of interest to you that Blessed (Saint, in some areas) Hildegard of Bingen had synaesthesia. Saint Cecilia is also said to have experienced synaesthesia. There is a lot of information about Hildegard, but not as much on Cecilia.
*Sorry for all the edits.Edited at 2011-03-25 02:30 am (UTC)