The theist and the atheist are the same person looking at each other in the mirror.
There is no way to prove or disprove the existence of God or whatever other label you want to put on the subject of the debate.
I don't think you can really do any better (if you are being thoroughly honest) than agnosticism. We weigh the evidence for there being a god...there isn't any...we put the results on the shelf...and there it sits...
I think about this stuff every single day. There is more evidence that god doesn't exist than evidence that she/he does exist. The best I can do is place myself on the continuum of doubt--the evidence shows that there is about 98.5% chance that god does not exist. However, it would be presumptuous to say that there is a 100% chance that god doesn't exist--how could I possibly know that?
Bottom line: All I can claim is agnosticism--not enough evidence one way or the other, but a strong indication that god probably does not exist.