Daddy, is God real?

A recent post by JJtheJester asked for creationists and evolutionists to give some arguments in support of their views, hoping to gain some material useful for religious education.This made me start thinking about a question my 5 year old daughter recently asked me, and no this isn't an apocryphal tale...

"Daddy, is God real?"

If my daughter was considerably older, I'd have a pretty good idea what I'd say. But she's 5.Is "Nobody really knows" a reasonable answer for a 5 year old? Would it be going too far to say "I don't think so because x, y, z" ?At the moment I intend to address questions on such matters with a non-commital answer: "Lots of people believe different things and nobody knows for sure". I find this unsatisfying, but wonder if it isn't simply the best answer at this age.I want to avoid "indoctrinating" her (though I don't think you can call the teaching of logic and reason "indoctrination") down a certain path, and yet I want to encourage her to ask questions and not to accept things on "faith" (using the definition: belief without evidence).I feel that the "Nobody really knows" response is simply too vague, but I worry that adding much more to that would be to guide her down a particular path. And yet, the more I think about this, I'd obviously like to see her become science-minded and skeptical.I would be remiss if I didn't point out that I believe in evolution and I consider religion to be a relic of our infancy as a species, one which we should strive to outgrow. Therefore, I'm mostly interested in how members of a scientific background would handle this, but It will be interesting to see what the religiously-minded have to say on the matter.Thanks in advance for any advice/suggestions.

Thanks to all for your comments.I especially like the cartoon Modulous posted, echoed by Perdition in his statement: I like the suggestion of "What do you think, sweetheart?" Puts the ball in her court and helps me figure out her degree of interest.I'm pleased to see that a couple of religiously inclined people have replied with positive responses such as: I would judge her as being pretty good at critical thinking for age 5, but then she is my kid so of course I'm going to think that. Having said that, I'm pretty sure that I can explain to her (in a way she will understand) that, as Phat said, "...belief is different from reality and is sometimes not logical."The Fictional Four have (for some time now) been a sort of joke with us, as she has clearly figured out that (spoiler alert) they aren't real. "Father Christmas" is a jolly notion that we continue with, but she knows better and says as much. I appreciate the comments of Coragyps and Stile regarding this matter. I manage to avoid feeling uncomfortable when it comes to these fictional characters by exaggerating them to the point where she can tell that I'm fibbing, and yet I don't come right out and say that I'm fibbing. She gets it.Thanks again for the replies. I feel a bit more prepared now for the next time this comes up, hopefully when she's 15 and tells me she wants to be an evolutionary biologist