Hello Michael
Sorry for this late response, but I have only just joined philpapers. I am a little hesitant to plug my own book, but it certainly seems very relevant to your inquiry. It particularly explores the later Heidegger and the implications of his thought post his 'turning' on non-theist notions of divinity, sprituality, environmental ethics, Heidegger's 'gods' etc. The book is called Only a god can save us – Heidegger, poetic imagination and the modern Malaise. It is published by Common Ground http://thehumanities.com/2009/10/15/only-a-god-can-save-us/
Regards
Henk