 While integration seems attractive (especially to theologians), it is difficult to do justice to both the scientific and religious aspects of a given domain, especially given their complexities. For example, Pierre Teilhard de Chardin (1971), who was both knowledgeable in paleoanthropology and theology, ended up with an unconventional view of evolution as teleological (which put him at odds with the scientific establishment) and with an unorthodox theology (which denied original sin and led to a series of condemnations by the Roman Catholic Church). Theological heterodoxy, by itself, is no reason to doubt a model. However, it shows obstacles for the integration model to become a live option in the broader community of theologians and philosophers who want to remain affiliate to a specific religious community without transgressing its boundaries. Moreover, integration seems skewed towards theism: Barbour described arguments based on scientific results that support (but do not demonstrate) theism, but failed to discuss arguments based on scientific results that support (but do not demonstrate) the denial of theism. Hybrid positions like McGrath’s POMA indicate some difficulty for Barbour’s taxonomy: the scope of conflict, independence, dialogue, and integration is not clearly defined and they are not mutually exclusive. For example, if conflict is defined broadly then it is compatible with integration. Take the case of Frederick Tennant (1902), who sought to explain sin as the result of evolutionary pressures on human ancestors. This view led him to reject the Fall as a historical event, as it was not compatible with evolutionary biology. His view has conflict (as he saw Christian doctrine in conflict with evolutionary biology) but also integration (he sought to integrate the theological concept of sin in an evolutionary picture). It is clear that many positions defined by authors in the religion and science literature do not clearly fall within one of Barbour’s four domains.