(2) Neither Barth nor Bonhoeffer were political leftists.
(3) Barth and Bonhoeffer opposed Nazism because they recognized it as explicitly anti-Christian and anti-Semitic.
(4) Barth and Bonhoeffer both strongly advocated the use of overwhelming force by the US and its allies to stop Nazism.
(5) Were Barth and Bonhoeffer alive today, they would not describe themselves as members of a "religious left", they would strenuously oppose militant Islam because of its anti-Christian and anti-Semitic character, and they would support the use of force to crush it.
Nicely done!