What these department does today?

Department of State

Department of Justice

Department of State

The Department of State advises the President and leads the nation in foreign policy issues. The State Department negotiates treaties and agreements with foreign entities, and represents the United States at the United Nations.  

Department of Justice

To enforce the law and defend the interests of the United States according to the law; to ensure public safety against threats foreign and domestic; to provide federal leadership in preventing and controlling crime; to seek just punishment for those guilty of unlawful behavior; and to ensure fair and impartial

it was made because he wanted to try to make people convert as well people who would have read or studied this item at the time it was created were probably people who wanted to change religions who thought conversion was a good idea.

d. promised it other land