The thesis of the complementarity of science and religion stated and argued for on the basis of the principle of ‘relationality’, according to which both science, as physics, and religion favor a relational paradigm. Science and religion are seen as saying different things about the same domain, namely, human experience. Other theories, such as the Conflict and Compartment Theories are reviewed. The ‘substantialist’ bias of Western philosophy is discussed, as well as its influence upon science and religion. Attention is given to the difference between the language of science and the language of religion: science is based on the greatest economy of hypothesis, while religious language is mythical, iconic, discourse. The latter is relational rather than referential. Human experience is defined as relating, experience. Scientific understanding and religious truth examined.