You are mistaking your interpretation of the text for the actual content, or range of possible interpretations.

Or more harshly (your preferred style it seems), you are treating your own consciousness as an omniscient God.

"Goddidit" is supposed to, I take it, refer to saying something like: "We don't know how to explain this. Thus, God did it." The fine-tuning argument isn't the same. The fine-tuning argument says, "We know that the universal constants, had they been slightly different, would not have allowed for a universe in which life was possible. The probability that these constants are what they are by random chance is very low---so much so that the probability that these constants are what they are by random chance seems to be much lower than the probability that these constants were chosen intelligently. Thus, we should believe these constants were in fact chosen intelligently, which implies a designer of the universe." It explains why the low-probability event of these constants being what they are occurred. You can have objections to the argument, that's fine, but it's an explanation nonetheless. And it has the same predictive power---that is, none---and leaves the door open for further inquiry just as much as the other explanations (e.g. "It's a coincidence" or "There's a multiverse" or "Of course it's this way, otherwise we wouldn't have been around to observe it").