Well, to be honest, I'm an atheist, but I wouldn't pass up the opportunity to kill a god. And I'm not really fussy about which one, either. Everything that has a beginning has an end. How I'm going to proceed in killing said godly entities, I have no idea at this point. However, forget any 'Clash of the Titans' kind of duel, with fireballs and lightning flying everywhere. It would have to be something stealthy, while I look for weaknesses, maybe even a straight out assassination if a shot presents itself.
As for why I'd do that? Certainly not because I'm remotely interested in higher ideals, such as the survival of mankind, or upholding some ancient principles. I'd rather do it to prove the failings of religion, or to test myself against cosmically calculated odds. Or I'd just do it 'cause I have a death-wish.