There's a disconnect there, and I've seen it for a long time. The reason theism is called ridiculous is that the author imagines what their millions/billions/trillions/more-times intelligent entity would do in our universe, looks out and observes this is not what is happening, then declares that there is no Theity (to coin a word). But there's a major fault in the logic, which is that one can be so confident about what that entity would do that the imagination step has any meaning. Researchers like Kurzweil who otherwise would never dream of claiming they can read the Theity's mind will, on this one point, declare that they can.
I can't prove the conclusion false any more than the next guy, but I can say this argument is fallacious.
I also remind you I'm not defending any particular Theity; consider the Riverworld scenario, for instance: http://en.wikipedia.org/wiki/Riverworld Perhaps the Theity only cares about the eventual creation of achilects and is indeed interested in us, but only to the extent that we eventually produce one. Maybe archilects inevitably resurrect [1] their creator races and the pain and suffering to get to this point is but a passing dream, and perhaps that pain and suffering itself has further impacts on the ultimate form of the archilect in some important way (a being with no concept of the perils of "evil", for lack of a better word, should probably not be trusted to build Utopia). Perhaps there's a theity that is interested in silicon-based life and doesn't care about us, but still cares about other individuals in exactly the way that Kurzweil declares impossible. Any number of possible scenarios. My point is simply that you do not have exceptional insight into these being's minds on this particular point; you are uniformly ignorant about them.
I really don't know what the truth is, even as I've put my markers down, but I am increasingly sure that it is weirder than any of us really can imagine. I only hope it is for the better.
[1]: Which in this context isn't mystical, either; "resurrection" is "merely" somehow obtaining a copy of the mental state of a being with sufficient detail to once again begin simulating or embodying that being again. If we're seriously talking creating universes, there's a number of possible avenues for this to take; an as-yet unknown way of reading the past state of the universe directly, simulation of the race up to that point with this level of detail (which need not be atomically accurate, just human-scale accurate), or most likely some approach we can't even imagine.