Sure, that's technically an issue, but not something that will probably ever become an issue in practice. Prosecutors who get a police report on their table evaluate the merit of the case and choose whether to dismiss it or prosecute it. So while this law could be abused because of a fuzzy definition of "creed"... It would have to be a very elaborate scheme where you'd have to fool both the public and the police that your case is within the spirit of the law, a prosecutor, and then finally a judge and five jurors (Sweden doesn't have a jury system with regular citizens), for extremely little gain? Swedish courts tend to be conservative with punishments and fines. Just wildly guessing here, but a normal fine amount for this type of crime could probably range from $500 to $5000, and this is not awarded to the defendant. There can be damages awarded as well, though damages are generally very unimpressive in Sweden and of similar amounts to fines. There are other problems with the wording of this law that I think are more egregious, I'm not under any illusion that it's a perfect law even though I agree with the sentiment and spirit.

The full law run through Google Translate:

Chapter 16, 8 § Anyone who, in a statement or in another message that is disseminated, threatens or expresses contempt for a national group or another such group of persons with allusions to race, skin color, national or ethnic origin, creed, sexual orientation or gender-transcending identity or expression, is sentenced for incitement against a national group to imprisonment for a maximum of two years or, if the crime is minor, to a fine.

Remember that, while the translation is actually very accurate imo, there are words that have a slightly different nuance in Swedish, and some words here that exist in Swedish but don't have a full equivalent in English. "National group" isn't very correct here as a translation of folkgrupp, and "creed" is an ok but not 100% translation of trosuppfattning. "Contempt" is close, but the nuance is a bit different in the original missaktning.

Some other issues: What is a "message"? What does "expresses contempt" mean here, what constitutes expressing contempt? Is a Quran burning a message, or does the context of the Quran burnings imply a message in this case? Where is the line drawn for "expressing contempt"?

Courts are very protective of the Swedish constitutional right to free speech, which is why the recent Quran burnings are characterized by many legal experts as legal and valid religious critique. But others instead argue that the main intent here was not to critique religion, it was to incite, provoke and disrespect.

It's a fuzzy line to walk, but there is a pretty high bar for sentencing something as incitement under the cited law, when it stands in opposition to the constitutional right to free speech.