I believe none of them said something wrong. However, words make difference when people from different cultures communicate with each other. Secondly, sensitivity of the subject is not common for two people from different cultures and especially religions.

You may never now the severity of your words unless you belong to the same faction of people whom you are speaking to. We should try not to evolve bad feeling if we can use words more carefully. It costs you nothing but it may add value to your posture.