Kyas
You are incorrect in your assertion that you have quoted all the quranic passages about the trinity. Mary is most definately included in the quran's perception of the trinity. Interestingly, you started out by saying "the only verse..." later you say "another verse...." So please don't imply your research was exhaustive, cause it is not. This has been pointed out by many others beside me, and the Muslim scholars have responded by trying to explain it away (to no avail). In otherwords, you are most definately incorrect.
in regard to your post about can Allah have a son..come on...re read the passage...one says one thing, the other says something totally different. You have given a litany of verses saying he does not have a son. but that does not excuse the clear contradiction in those 2 verses.