ConsequentAtheist:
<i>Since you do not offer "None of the above." as an option, what convinces you that the question is meaningful? Also, what methods/protocols would suggest be employed to ascertain an estimate?</i>
Read the question again:
"Given <b>your knowledge and beliefs</b>, what is the percentage chance that God exists, <b>according to you</b>?"
I suggest that the protocol you adopt to answer this question is to estimate the probability based on your knowledge and beliefs, as the question asks.
The question is looking at belief, not at an objective mathematical probability. I thought that would be obvious.
<i>My guess: it's roughly equal to the average weight of pixie dust found in 1cc of Daoine Sidhe air space times the standard length of the unicorn horn divided by the total weight of the Sumerian, Egyptian, and Roman pantheon as measured on Atlantis. If anyone can supply these, or more appropriate, numbers, I'll try to be more specific.</i>
I'll put you down for zero, then, shall I? (There is no category between zero and 1%.)
That wasn't so hard, was it?