"But I have faith!"

I recently came across this article by Charlie Glickman. Glickman's post is about confronting religious people vis a vis their religious views and how one should properly approach such an affair. He writes that we should engage with respect to the believer, not necessarily with respecting the beliefs of the believer. I agree with much of what Glickman wrote and this is a topic that I've frequently commented on.

However, in the comments section, a user named Dawn Fortune writes:

I like the idea of challenging ideas and of challenging beliefs, and of questioning both without ridicule or shame, but I think what is missing is an understanding that matters of faith are that: matters of faith, and not all can be measured, quantified and duplicated using scientific method. Also what must be kept in mind is that faith is enormously important for a lot of people, and some traditions have doctrine that calls questioning of those beliefs an exercise in sin to begin with.

This reminds me of a common exaltation I've heard from religious believers: "But I have faith!" There are so many things wrong with this....