Someone I know (Jewish, of course ;-) is a tour guide in Israel. He specializes in guiding Christian Pilgrim groups. They visit primarily Christian sites. Usually, as part of explaining a tourist place, the guide recites verses from the Gospels that refer to Jesus and Christian principles and beliefs.
Does citing such verses pose any halachic problems? The guide has no belief or attachment to any Christian principles. He uses these verses merely as means of contextualizing the site the group is visiting.
(Please do not focus on other possible problems such as whether he can enter a church. There are debatable opinions on this.)