I took a friend interested in Buddhism to a centre. This person is Catholic and doesn't want to change that; she is very satisfied with her religion. However she was curious about Buddhism and specially meditation.
At the end she was a bit disappointed because there were 2 mentions of other religions (catholics and other buddhist schools) that she thought were driven by a big "pride", for example: "Here we don't do this...in other centres they do"; "We value this, catholics don't".
I didn't have the same interpretation, however I agree one should be very careful on talking to an open public about other religions and traditions, as it can be very easily misunderstood. We don't need to use other religions to make a point.
So, the question is: Is there any Buddhist code of ethics on that? In the Vinaya maybe?