Q: How do you talk with those of other religious persuasions (or none at all) when their first approach to you about Christian Science is adversarial?
A: The answer is in three words: love, love, love.
On the face of it, this might look like a two-way conversation: one person challenging, and another being challenged. See through the physical and verbal façades. Refuse the temptation to see her or him as farther from the truth than you are. We are all on an individual journey toward a more accurate understanding of the creation and its creator.