Daß es sich im Alten Testament um eine bewegende Sache handeln möchte, fing mir erst in Berlin bei Gunkel aufzugehen (Nachwort 190f.; Busch, Leben 51; cited in Bächli, Das Alte Testament in der Kirchlichen Dogmatik von Karl Barth, 3.What was it that Barth saw in Gunkel? I won't share my thoughts here, as my own answer constitutes part of my thesis (though see Bächli on pp. 324-325). I just wanted to share this quote as a witness to the fact that Barth, and Childs, never intended or wanted to escape the challenge of either the Enlightenment or historical-criticism. Their approaches go through it and thus result in a vision of Scripture and God which, as far as I am concerned at least, makes my heart burn. I worry that the contemporary growth in "theological exegesis" hasn't fully grasp the move made by Barth and then Childs on this score.
Otto Bächli's book is awesome (I'm surprised Childs' didn't cite it in his Biblical Theology). Incidentally, he was born in Switzerland in 1920 and there a section on him on this amazing website by the Swiss Reformed Church dedicated to the memories of Swiss pastors during the war. Here's the reason he got into Old Testament: