In this article the author describes and analyses the problem of mutual isolation of various explanatory models proposed by specialists (in history, philosophy, theology, religious studies, sociology of religion etc.) to explain the decisive causes of European secularity (especially in relation to the supposed role of Western Christianity in this regard) as this problem can be demonstrated in recent Czech scholarly debates on the causes of European secularisation. The author suggests that only a widely based interdisciplinary approach to this issue (of the exact relation between European secularity and the specific characteristics of Western Christitanity) can avoid the unsatisfactory consequences of mutually isolated specialised attempts to answer this complex question