Larry Hurtado has some comments up about Darina Staudt’s 2012 Der eine und einzige Gott: Monotheistische Formeln im Urchristentum und ihre Vorgeschichte bei Griechen und Juden. Here’s a snippet:
This is a survey-analysis of the use of several “forms” (fixed expressions) used in ancient texts that figure in discourse about gods: εἷς θεός (“one god”), μόνος θεός (“only god”), and οὐκ ἔστιν ἔτι πλήν (“there is no other”). The main purpose of her study is to trace the background and possible influences upon the way in which “monotheistic” language is used in early Christian sources, and also how the risen/exalted Jesus is so readily incorporated into what we may call “God-discourse”.
Looks like an important contribution to understanding how early Jews and Christians conceived of God. I look forward to getting a hold of it.