Is the World Trade Center a gov’t bldg. or on gov’t property? If it isn’t, he doesn’t have a leg to stand on. If it is, he still doesn’t have a leg to stand on, as there is no such thing as “separation of church & state”.
Not only will the Cross remain (Dawkinists are easily pwned), but a group of clever people could petition to have every skyscraper in Manhattan display the Cross in building lighting on the night of 9/11/11.