Rosenblad was a member of the Swedish Bible Society and the Swedish Mission Society, and on 21 May 1805 he became an honorary member of the Royal Swedish Academy of Letters, History and Antiquities. From 1804–1806 he was president of the Pro Fide et Christianismo society.
Rosenblad was affiliated with the Swedish Bible Society and the Swedish Mission Society, and on May 21, 1805, he received honorary membership in the Royal Swedish Academy of Letters, History, and Antiquities. From 1804 to 1806, he held the position of president for the Pro Fide et Christianismo society.