What does Flannery O'Connor means by the ultimate reality is the incarnation?

In Catholic theology incarnation means "the Word made flesh."  It is God's "emptying Himself" to become a man, to suffer and die to redeem mankind.  O'Connor moves her characters to work backwards from lives of evil toward a fundamental belief in the incarnation, as if they were experiencing it in its origin.

O'Connor's fiction is implicitly messaged from a believer and explicitly styled and aimed at nonbelievers. In O'Connor, we find a devout Catholic author who characterizes evangelical Protestants, an orthodox who divulges no explicit theology, a writer of Christian concerns who lampoons modern Christendom, a comic writer of the gravest themes, and a female author whose style is gender-neutral--nay, manly.

Her comic religious vision holds that a morally and socially degenerate is nonetheless spiritually a cut above the wingless chickens of privileged Christianity. She shocks her readers by beginning with divine evil as a backdoor to what is divine good so that they may rediscover what is holy, or incarnate. Her goal, I think, is to prevent her readers from taking sides among her religious forms; instead, she calls for action--from them to be seekers instead of being found.