Is using the expression "Where in hell...?" giving someone a cursing?

Carrie, my local internet rep., infuriated me one day so badly that I I said “where in hell…”. After a brief placement on hold (so she could tell her supervisor on me and have the call monitored), she advised me that she would have to ask me not to curse her.

I live firmly within the buckle of the Bible Belt, so I immediately asked, “What? How is Hell a curse? Are you not a Christian?” Things smoothed out from there.

Do you consider hell a curse, and are you offended by its use?