"christian" license Plate RUled Against

A federal court  ruled against a special license plate in which seemed to violate the constitutional separation of church and state.  The plate consisted of a yellow large cross with a glass stained window with the words "I Believe".  Supposedly this clearly favors government treatment to one faith which caused it to be ruled against.  This was seen as "unconstitutional and un-american".  I think that there is nothing wrong with the license plate.  I find it completely acceptable in every way.  If you want to look down on it and believe it represents one thing then thats their problem and shouldn't worry about it.  The thing I see hard to understand is it is just a license plate.  People can express themselves in anyway they want considering this is a free country.  People shouldn't be limited to ways that they can express oneself.  I believe that people accept people for being themselves and not being afraid of doing something you believe in that causes no harm to people around you.