It's not my proposed idea, it's an actual, contemporary Swedish law which has existed since 1948. What is up for debate is how that law is to be interpreted in this instance, what constitutes "creed" (in, perhaps, a better translation of the original Swedish instead of "religious belief"), and what constitutes a "message" and whether burning a Quran is valid criticism of Islam or if doing it at that time and place is a hate crime targeting Muslims. It hasn't been tried in the Swedish supreme court whether Quran burning in certain contexts like the recent events is illegal under that law or not.

Technically, sure, you could argue that everything can be a religious belief/creed and any belief is covered under that law. But that is not how the law is interpreted and used in practice. I would consider that a strawman argument then, because it intentionally misrepresents the spirit of that law.