In a work of fiction, the mood is the blank of the piece. location, atmosphere, background, or perspective

The answer would be ATMOSPHERE.

The mood is a literary element in fiction which is commonly referred as the atmosphere of a piece of writing. It evokes emotions, feelings or vibes in the audience or reader. It creates a particular emotional setting.

The answer is then ATMOSPHERE.

it exposes the hypocrisy of religion and christian supporters of slavery

1- cleans/ tidies up

2- were

3-would be

4- had known

5-takes

6-must be/ have to be/should be