Bonhoeffer was a protestant theologian and Nazi resister who was hanged shortly before the end of WWII. Add this documentary to your NetFlix queue. Order it from Amazon. This is truly an amazing man.
Here are a couple of quotes from his writings:
On the waning of The Church:
Christ is really present only in the community. The church is the presence of Christ, just as Christ is the presence of God. But our church today is bourgeois: the best proof is that poor working classes have turned away from the church. Whereas the bourgeois, the petty officials, the artisans, and the merchants have remained. When the community is split, is Christ himself divided?
On the failing of man to act on Christ’s teachings:
We have been silent witnesses of evil deeds: we have been drenched by many storms; we have learnt the arts of equivocation and pretence; experience has made us suspicious of others and kept us from being truthful and open; intolerable conflicts have worn us down and even made us cynical. Are we still of any use?