If you think the cross isn't an offense, just wait until the Gideons show up at school. 

One Texas school district is hearing complaints from parents because the Gideons were allowed to leave a stack of Bibles on a table in the school's office where literature and brochures from numerous community organizations was available for students to take. Never mind that the school district was following the law in this matter.

As for the Gideons, I think this is what Jesus would call being "as shrewd as snakes and as innocent as doves."