Finland and Scandinavia
doesn't share lingusitic or cultural traits with the three Scandinavian countries
Linguistically? no, Finnish is not related to any Germanic language, but note that about 5% of Finnish citizens have Swedish as their mother tongue, and the language has an official status here. Culturally, Finland is very similar to Scandinavian countries because of the long shared history. After all, for hundreds of years Finland was part of the Kingdom of Sweden. We also have the same majority religion (Lutheran).
So the connection of Finland with Scandinavia is much more than "just happens to be in the neighbourhood".