Interesting agnostic link:
http://www.arts.cuhk.edu.hk/humftp/E-text/Russell/agnostic.htm
I do not believe that anyone really knows. I understand faith, but get a little annoyed when there is no room for exploration within the individuals sphere of belief, and I'm not talking about changing minds, just allowing a discussion with respect for each others wishes to take place.
So, I would answer, I can't convince anyone as when you look at the two sides, neither can they and neither should they try. Most of the time, the reasons for believing or not believing are deep rooted within a person, and for an outsider to understnd that passion, wherever it may come from, is a difficult task to set, but I suppose, not wholly unachievable.
And anyway, once all of this convincing is over with, it doesn't prove anyone is right!