dear thread starter,
you asked for us to play the devil's advocate. this is a tall order for me, sorry. but an excellent, excellent essay that looks at arguments for the positive (existence of god), are reviewed here:
http://ebonmusings.org/atheism/unmovedmover.html
what i love about this guy's essays, are that they are approachable and well written. i also like that he does not let theist's get away with their implicit assertions in their argument's. basically, a person who believes in god, and has faith in him (afterall, how could they know for sure he exists without faith!), has an implicit assertion that he exists in all of their arguments. therefore they are required to provide proof of his existence, and to define the terms of the debate with a non-theist.
it's nice being on the rational side of the argument...er, sorry, i meant the default side...