I don't see how so.
I can imagine lots of ways in which the world would be different if a superpowerful superbeing was around with the ability and will to shape reality for whatever purpose -- but when I imagine the superbeing's absence it looks like the world around us.
When I try to ask the theists what the world would have looked like without God, I don't get very convincing answers.
The trouble with theists considering a "world without God" is they generally think God created the world, so without him there wouldn't be a world at all. Obviously, this is not what we observe.
On the other hand, attempting to point at things which clearly couldn't exist without a Creator generally falls into the category of "god of the gaps", both in terms of the criticisms it levies and, alarmingly often, in terms of already-understood science.
Perhaps a world of Boltzmann Brains? But then, I've never really seen the logic behind "...
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A note for theists: you will find the Less Wrong community to be predominantly atheist, though not completely so, and most of us are genuinely respectful of religious people who keep the usual community norms. It's worth saying that we might think religion is off-topic in some places where you think it's on-topic, so be thoughtful about where and how you start explicitly talking about it; some of us are happy to talk about religion, some of us aren't interested. Bear in mind that many of us really, truly have given full consideration to theistic claims and found them to be false, so starting with the most common arguments is pretty likely just to annoy people. Anyhow, it's absolutely OK to mention that you're religious in your welcome post and to invite a discussion there.
A list of some posts that are pretty awesome
I recommend the major sequences to everybody, but I realize how daunting they look at first. So for purposes of immediate gratification, the following posts are particularly interesting/illuminating/provocative and don't require any previous reading:
More suggestions are welcome! Or just check out the top-rated posts from the history of Less Wrong. Most posts at +50 or more are well worth your time.
Welcome to Less Wrong, and we look forward to hearing from you throughout the site!
Note from orthonormal: MBlume and other contributors wrote the original version of this welcome post, and I've edited it a fair bit. If there's anything I should add or update on this post (especially broken links), please send me a private message—I may not notice a comment on the post. Finally, once this gets past 500 comments, anyone is welcome to copy and edit this intro to start the next welcome thread.