You manage to talk in a logical and precise way (and with what seems to me a very good manage of english). But i can stop this uneasy feeling that you are being offensive.
You are not sayng something special or different. It is just the way a normal common well educated tolerant person should think and act upon when confronted with religious individuals. Many atheists i know inmediatedly start a battle everytime they can when they met someone who belives in god.
The problem i think is the way you thought about it. There is a hint of superiority that is a constant on your words. I mean i can´t deny that the concept of god as an entity is a delusion.
You talk to much, say nothing new, and somehow manage to made me want to begin a discusion with you defending my right to my own personal spirituality.
TL;DR: you made me agree with you and at the same time i want to punch you in the face (figuratively).