Reddit mentions of The Crucified God

The easiest way to get Christianity is to read the Bible. But to supplement that, I would encourage you to read books by these two German authors: Dietrich Bonhoeffer, and Jurgen Moltmann

Bonhoeffer was a prominent leader of the confessing church (the church that resisted Hitler) and was a prominent member of the German resistance and a part of the Valkyrie plot. If you want to know more about him and his life, Eric Metaxas wrote an excellent Biography about him. Bonhoeffer's most famous works are "Life Together" about living a life in Christian community, and "The Cost of Discipleship" which is about Grace and how we must not live in a place of cheap Grace. Bonhoeffer was executed a t Flossenburg concentration camp a few months before VE day, and there are some nice memorials to him there (about 1.5 hours east of Nurnberg).

Jurgen Moltmann was drafted into Hitler's army in like 1944 and was taken prisoner. He found God in a Scottish POW camp. Moltmann writes a lot about Hope and spends a lot of time exploring what Christ's sacrifices mean to believers. Some of his most famous works are "The Crucified God", "Theology of Hope", "Trinity and the Kingdom" and "The Way of Jesus Christ." Moltmann also comments on more social issues which arose in the post-war era and has a more social theology, which adds a unique depth to his writing.