Arrow of God explores how Igbo spirituality and religious life dies an ignominious death when confronted by Christianity. Christianity is backed by the white man's military and political power. As a result, Christianity is also identified with the source of their power. When the people of Umuaro are faced with famine because the chief priest of Ulu refuses to break tradition, the catechist at the church offers protection so the people can harvest their yams. When Ezeulu's son Obika dies, the people interpret that as a sign that Ulu was punishing his priest. With Ezeulu's power broken, Umuaro turns to the Christian god for help.
Although the people of Umuaro turn away from Ulu towards Christianity, they are turning their backs only out of desperation.
Although Mr. Goodcountry says he's offering the people of Umuaro protection against Ulu's wrath, he is taking advantage of the opportunity to enrich his church through the people's suffering.