diety that may or may not be a god? You're fucking ******ed. Do you know what diety means? IT MEANS GOD, YOU STUPID FUCK. LOOK BEFORE YOU LEAP, AND LEARN BEFORE YOU SPEAK. JESUS CHRIST.
But the literal definition of "deity" is "a god". So really, you could just use OMD. And what about all the athiests and agnostics and such? I suppose that OMD wouldn't work there, so it's not politically correct. I suppose that OMF would work better (Oh my figure), but then you would have to add the "That may or may not be a god" back on there. However, this is arguable still as to whether or not it applies to agnostics. Then again, political correctness can just go fuck itself.