There's a girl at my school who wants to be a minister, she found out I was Atheist and for about a week I became her personal project. She told me all the usual line about feeling god in her life and how it answers all her prayers (yes I refer to god as an it. If there's only one of them how does it have a gender). Anyway I asked her about all the starving children of the world, and all the kids born with HIV/AIDS in Africa and she said "God works in mysterious ways."
Now my question is, why should I worship a god? Even if I had ABSOLUTE PROOF that a deity existed why would that make me want to bow down to the scumbag? Would you? Why do Theist think that if they can only prove the unprovable that we will all convert?
eh. this kind of misses the mark as a critique.
consider that, while your question "why would [his (or "its" if you rather) having been proven absolutely] make me want to bow down to the scumbag?" makes sense to other atheists, it's not going to make sense to her since she doesn't view god as a scumbag. her very simple answer would be to say "he's not a scumbag, that's why."
Actually I would. If someone could prove to me that a god existed, really for real, and he/she/it wanted me to lay face down on a pile of turds in trade for some happy chocolate and candy canes kind of eternal life, I would dive into those turds like they were Honey Nut Cheerios. That's just me though.
The point is that there isn't a shred of evidence for the existence of any kind of deity or paranormal hoo-haw, and I'm not foolish enough to by a pouch of magic beans. If you want to develop some debating skills though, I suggest you follow the links that Nelson offered below.