She had always known that was rated less than Howard, the treasured son. Now, however, she knew that she was ranked somewhere belong 'miscellaneous cuttings.'”
-- Narrator (chapter 12)

Importance: Faith has just been left on the side of the road, along with Uncle Miles and Tiberius Clay. This may seem that she is being overly dramatic, she is not. A short time after this scene, Erasmus outright tells Faith that a daughter is nothing but a drain on a family's finances.

The ladies were left behind to be looked after. Faith felt as if a door had slammed in her face.”
-- Narrator (chapter 4)

Importance: Faith's family is at the excavation site for the first time and she, Myrtle, and Agatha are left behind while the males go a short way into the tunnel. Even Howard is with the men, making it clear that the only reason Faith is excluded is because she is male.

The Bible...
-- Narrator (chapter 5)