I think it would be very difficult to portray America as a "Christian Country" when slavery was being supported.
Most black families in this country at the turn of the 1900 were Christian,...just 40 years after the war of northern aggression. They were the victims of imperfect men. In the 1750's Great Britain was in the social upheaval of throwing off the shackles of slavery. By the late 1760s there was a great controvery in this country as to the disposition of slavery. John Adams and Abigail Adams wrote of the evils of it. Jefferson wrote of its evil yet still owned slaves. Washington gave his slaves his name and their freedom at his death. He is said to have treated them like family. This was the mileu in which these people lived. Many Christian leaders spoke out vociferously against slavery, and eventually Dred Scott was struck down in 1857. Segregation persisted until the mid 1960s and still persists in the hearts of some all over this land, but it does not negate the propiciousness of Christianity and its essential doctrines. There are many injusticed people foster over on one another, but the tenents of Christianity remain stable. It is the human heart which is deceitful above all things and desperately wicked, who can know it?
No more difficult than in the world Christ inhabited, where slavery was commonplace.