Fanman, you didn't really answer question 1. Which God/Gods are you agnostic about? All of them?I don't believe that any of the Gods purported by any of the religions that I know of exist. What I'm agnostic about, is that I think there may be an intelligent creative force in the universe, something that would seem to us like a “God”, but that is not necessarily like any God described by the numerous religions. That there may be an intelligent creative force, is a far as I'm willing to speculate. I don't add any form of identity to that supposition, it is just something that I believe may be possible.
Where do you draw the line between God/Gods and other things which you don't 'know' don't exist. For example are you agnostic about Santa Claus, and if not why not?I don't really understand the first part of your question (but I'll try to answer as I understand it). I don't really draw a line, such as to say, this can exist and this cannot exist, I just don't believe based upon what I understand is being claimed. Re the Santa Claus question, you're surely jesting?
I don't think it needs to be in relation to anything. A theist might go to church. They may say they believe gay people are evil. They may pray etc etc. An atheist would do something else other than go to church, they can of course still hate gay people but they can't say it is for religious reasons. As f4 says if you are judging purely by action there may well be next to no difference between atheist, agnostic and theist. Actually my suspicion is that on the whole there is no difference (if judging by action) but that is a different conversation, I am responding to claims other people have made. I myself do not claim agnostics act differently, but I am interested in those who claim that they do.
My actions have certainly changed from when I was a theist, in that I've stopped partaking in the religious activities I did. I suppose I could say that my actions changed to suit my new world view in that respect. Generally speaking, I think that people's beliefs affect their behaviour/actions, although I'm not sure if agnostics engage in any actions that are inherent to agnosticism?