Social Awkwardness?

Well I had a wonderful thanksgiving with my family today (or yesterday, if you wish to be semantical...), but the before dinner prayer and thanks came across as awkward as hell. In retrospect, I probably could have saved face by just getting up and staying there until they had finished. Alas, I had not and what is done is done. I suppose what I'm truly thankful for is that I was the third person at the table to to the prayer and thanks, so it was pretty much forgotten by the time they got to my brother. Here is in large what happened:

I was contemplating leaving the table as everyone bowed their heads, but decided against it. Everyone (including I) bowed their heads and my grandmother started praying. I hadn't closed my eyes, and instead just hid my eyes under the brim of my fedora. She gave the usual thanks for the food her health and her family (wealth understandably not being there this time), then everyone unbowed their heads and we went around saying what we were thankful for, and when it came to be my turn I said "pass"...unfortunately it failed. My family spent a minute trying to coax an answer out of me, but I still refused and felt awkward as hell. They continued around the table, and the usual thanks were given for food/love/family/thatfrellingministrywebsiteofmyaunt's and so on. Afterwords dinner began uneventfully as possible for my family, and concluded likewise.

For those of you wondering why I didn't just give an answer, its because the way it is phrased. Its unspoken, but in essence when giving thanks you are saying "I am thankful for "x", to Jehovah", and that makes me uncomfortable. I could have also said something mildly mocking, but I don't need to be seen as the ass of the family of smartasses.

[on a side note, my grandmother is very into end times prophecy (christian specifically), and has many books about the end times lying around. She requested that I get any book from bible canon that I could. I normally would turn down such a request, but the awesomeness of letting her read the apocalypse of peter is worth taking the time out to google and print most of the others.]