Why should the Christian speaker drop Christmas from the seminar title? It's his seminar, and he gets to decide what to title it. In fact, I think it is offensive to suggest that Christians should sterilize Christian history and iconography from anything they produce.
If Donald Knuth decided that his Christian iconography was interfering with the message he wanted to send, then it's his talk and he gets to decide to change the title.
If a Jewish/Christian/Muslim professor wants to talk about the 9 Lifos of the Menorah, I don't see a problem with that, either.
If Donald Knuth decided that his Christian iconography was interfering with the message he wanted to send, then it's his talk and he gets to decide to change the title.
If a Jewish/Christian/Muslim professor wants to talk about the 9 Lifos of the Menorah, I don't see a problem with that, either.