After World War II, Sørensen was a member of the Danish Parliament and Minister of Ecclesiastical Affairs.

He felt that the Cabinet of Stuning-Munch, which led the party, was parliamentary ineffective and was too sympathetic towards the Government of Nazi Germany.

[1][2][3] During the German occupation of Denmark, Sørensen was an active resistance fighter in the Holger Danske group and in 1943 he became a key member of the Danish Freedom Council.

He authored an article in 1973 which argued for an expansion of immigration in Denmark in order to fuel the country's economy.

Sørensen taught lectures in the United States in the later part of his life and frequently traveled between the two countries.