You can read my article on the turbulent history of Christianity in Sweden, from the 9th century to our own day, in the October issue of the Catholic Herald or here: https://catholicherald.co.uk/the-rise-and-fall-of-swedish-catholicism/. The article accompanied a piece by Cardinal Anders Arborelius: the first ever Swedish cardinal. Together, the two texts will bring you bang up-to-date on the fate of Catholicism in the country.
