A "methodological" approach is concerned with practicing theology in a "scientific" manner and focuses on clearly articulating the assumptions, methods, and related thought-forms to be taken into account in the construction of dogmatic formulations.
[8] Rather, McGrath seeks to draw upon the proven assumptions and methods of the natural sciences in order to inform the practice of Christian theology.
[21] A Scientific Theology is intended by McGrath to be ecumenical in approach and valuable to Catholic, Orthodox, Protestant and evangelical readers.
[23] Due precisely to the scope of the work, McGrath felt led to prepare a short volume The Science of God which "is designed to introduce the distinctive themes and emphasis of this scientific theology to a wider readership"[24] In intent, the trilogy is a very ambitious project which seeks to lay a methodological groundwork for further theological reflection.
Writing in the conclusion to the third volume he explains; The process of unfolding what seemed like a bright idea back in 1976 has proved to be far more difficult than I had imagined, and its execution less satisfactory than I had hoped.
Initially, it seemed to me that the vast spaciousness offered by these three volumes would be more than adequate to deal with the issues I knew had to be addressed in articulating a coherent and plausible vision of 'a scientific theology'.
The Science of God is a small book prepared by McGrath to introduce the themes and emphases of A Scientific Theology to a wider readership.
[26] Four considerations guided its preparation; Fleming, noting the impact of McGrath's project, describes The Science of God as "an accessible place to begin following what is likely to become one of the most influential areas in the science-religion dialogue.
Willem B. Drees, Leiden University, The Netherlands, offered a lengthy review of Volume 1: Nature in which he followed a summary of the work with a solid critique.
There are three points at which Drees critiques McGrath throughout the review; Drees concludes; “McGrath’s book is rich in historical detail and in footnotes (I wish they had been covered by the index as well) and very outspoken in its judgments … [but] I find the book falling short in the accuracy with which it deals with other positions and with complex issues such as the philosophical arguments pro and contra scientific realism...and theological realism.”[33] Larry L. Rasmussen, Reinhold Niebuhr Emeritus Professor of Social Ethics, Union Theological Seminary, considered A Scientific Theology: Volume 1, Nature to be “immensely learned and instructive.” After giving a brief summary of the volume's themes and contents he concludes that McGrath is "in full command of the English and German language sources within what he calls 'the western intellectual community.'"