Why has the church failed???

Why does society still suck? Why doesn't the gospel convert everyone who hears it? Why the denominational wars and so many people who proudly wear the badge 'Christian' and yet seem to deny it by their actions?

Emil Brunner has an interesting answer:

No Christian possesses absolute faith, no one is is really wholly converted, if regard these expressions empirically.

It also forms part of the incognito of Christ that the final significance, the absolute turning point, which His Cross means, can never appear historically in its effects.

It's all because of the 'incognito' of Christ, his veiled-ness. Reckon he's onto something?