I didn't take this one, but the last rather serious test I took, under less than ideal circumstances, gave me a score of 125 (while I was still a theist). However, as mentioned, a high score on an online test isn't much to brag about. A good IQ test should be made in such a way that it could rather precisely measure even the IQ of a "bush man" with no knowledge of math. It's all about your ability to solve problems within a time frame, and matching the result to your age.
As for who is the more intelligent, theists or atheists, I don't think the IQ score necessarily is any different, at least not on average. It's more about how you use that intelligence, and what you constantly tell yourself is correct, and how that defines the outcome of your thinking process.
-There are theists with a long education in theology and things related to it, and can answer most questions regarding what they believe. Then there are theists who haven't really read up on anything at all, but are 'saved' in one meeting and from there on all they need is 'faith'.
-There are atheists with a long education in various sciences who can answer pretty much any question they may get asked about it. Then there are atheists born from atheist parents and haven't really thought much about it, but surmise that God can't exist because there is a lot of evil in the world.
I used to be a theist, and am now an atheist. I doubt my IQ has suddenly shot through the roof because of it; I've just started thinking in a different manner, with a new set of "ground rules".