郎尼根主張在廿世紀時，吾人認出了文化的多元主義。他認為每一個文化有一種或多種宗教，宗教是嵌在文化中的。因此，宗教也是多元的。辨識出多元文化為宗教交談提供了一個新的方式，即多元性是一種文化世界，在其中宗教交談被理解成宛如包含了文化交談。再者，他主張宗教交談必須辯證地進行。換言之，在宗教交談中最重要的是要意識到：在宗教經驗中、在文化中和在表達中的本真和非本真的問題。本真的測試，是在於觀察人的行為，而非透過對他／她們理論的理解。至於宗教交談的結果，是充滿了驚訝，因為它是一種經驗的過程。

Lonergan thinks that human beings recognize the existence of a pluralism of cultures in the twentieth centuty. He argues that each culture has one or more religions. Religion is embedded in culture. Therefore, religion is also plural. The recognition of the pluralism of culture provides a new way to understand interreligious dialogue. It means that pluralism is intrinsic to each cultural world and therefore interreligious dialogue is understood as including inter-cultural dialogue. In addition, Lonergan thinks that interreligious dialogue has to be conducted dialectically. In other words, the most important thing in interreligious dialogue is to be aware of the problem of authenticity and unauthenticity in religious experience, in culture, and in their expression. The test of authenticity is in observing peoples' deeds, not merely in understanding their theories. The result of religious dialogue will be filled with surprises, since it is an empirical process.