I found this very interesting paper. It's a PhD thesis at the Old Testament Science Department of the Pretoria University, titled "Does Yahweh exist? A philosophical-critical reconstruction of the case against realism in Old Testament Theology".
It offers a devil’s advocate's case against realism in Old Testament theology, in the form of the following seven arguments against the existence of Yahweh:
1. the argument from theological pluralism
2. the argument from unorthodox theology
3. the argument from polymorphic projection
4. the argument from mythology and syncretism
5. the argument from fictitious cosmography
6. the argument from fictitious history
7. the argument from meta-textual history.
The chapters can be downloaded as a PDF files at:
http://upetd.up.ac.za/thesis/available/etd-03192004-135203/
Behemot