A couple of recent books have especially convinced me of this. The first was James Cone's The Cross and the Lynching Tree
which illustrates that even white liberal Protestants of the 20th century failed to connect the horrendous lynchings in the south to the crucifixion of Jesus, even while they attempted to address racism theologically.
A second book, Dear White Christians (Prophetic Christianity)
makes the most compelling argument I have ever read for reparations as the essential paradigm for race relations, over against reconciliation. It is really a must read.
Of course, the recent movie Selma is also convicting, because it illustrates the degree to which the Civil Rights movements was a Black Church movement, and how infrequently the white church participated in the movement.
Some recent excellent essays on Selma include:
Why the Oscars' Omission of 'Selma' Matters
What went wrong with the Oscar hopes for 'Selma'?
What the hell happened to 'Selma'?
Selma and Clergy
Then there is perhaps the most important book ever written in English on race and theology, J. Kameron Carter's Race: A Theological Account
He and some colleagues have written an essential post today that is worth the time on King's faith as driving his activism.
Finally, this brief post from Huffington Post on MLK Jr.'s name change, includes a podcast with Paul Rauschenbush that is totally worth a listen: http://www.huffingtonpost.com/2015/01/17/martin-luther-king-jr-name_n_6481554.html?ncid=tweetlnkushpmg00000055