The cross is an offense to the unbeliever

"The message of the crucifixion is insanity to the lost, but to those of us who have life it is the power of God." (Aramaic Bible in Plain English.)

You would almost think this is from the Onion (parody/humor site), but I checked several versions. "Crosses in every room at Washington D.C.’s Catholic University of America are a human rights violation that prevent Muslim students from praying. That’s the complaint to the Washington, D.C. Office of Human Rights filed by a professor from rival George Washington University across town."

http://www.beliefnet.com/columnists/news/2011/10/lawsuit-says-crosses-at-catholic-university-offensive-prevent-muslim-prayers.php

http://sonsoflibertymedia.com/2015/05/catholic-university-investigated-for-having-too-many-crosses-because-its-offensive-to-muslims/

http://townhall.com/tipsheet/katiepavlich/2011/10/28/muslims_want_crosses_at_catholic_university_removed_before_they_pray#!