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Granted, ACTING in the name of "deity" doesn't NECEZZARILY make said act the will of "deity", but, as yet, it's impossible to rule out (as "deity" has never clearly delineated its "will" to anyone beyond a reasonable doubt; and why "deity" would have to have anything done by underlings remains laughably puzzling). It would therefore behoove theists of all stripes to stop making such claims (as the benign actions have all the accuracy of placebos, and the more-destructive actions tend to be viewed as outrageous by skeptics and disavowed by the faithful in hindsight).

If any code of conduct is based upon "the norms of society", then one's actions would be more likely than not to fall within the given norms; if a society's actions were so disjointed and haphazard, it'd have a hard time defining "normative".

Speaking for myself (and maybe a handful of other nontheists), I place a fairly high value on rationality and everything that concept brings to the table. If I proceed with caution, I've a fair degree of certainty that my actions will prove to be very beneficial, and could greatly influence most any modern society. Will this work at all times? Probably not, because societies have always been studies in change. But I'll be willing to bet that it'll work more smoothly within a steadily-secular framework than anywhere else.