Reviewed by David BurrellWiley-Blackwell, 435pp, £72Tablet bookshop price £65                   Tel 01420 592974In 1991 John Milbank issued a provocative challenge to theologians enamoured of the potential of social science for expanding the horizons of contemporary theological enquiry.If Milbank’s Theology and Social Theory altered the landscape 20 years ago, Michael Hanby’s penetrating and equally provocative inquiry dismantles enduring modernist boundaries to augur similar transformations in cosmology, metaphysics and philosophical reflection on science. Once Milbank had exposed two paradigmatic “social theorists” – Freud and Marx – as crypto-theolog