I agree Islam is more than “just a religion.” Though it’s fair to point out so was Christianity up to about 500 years ago.
But that it is “more than a religion” does not mean it is not a religion. It meets every logical, linguistic and legal definition I’ve ever seen.
To exclude it from legally be a religion would require redefinitions of the term, and then giving some government agency the authority to decided which groups do and do not fit the definition.
This would be a really, really bad idea.