You and Keith O are a pair. He mentions that there were two sites (a small room/closet and a stairwell) that muslims used to go to when they did their daily prayers. This does not make them Mosques by any stretch of anybody's vivid imagination.
Muslims, do daily prayers on sidewalks, streets anywhere they happen to be at the time of prayer if they feel like doing them. So by your rationale then all areas a muslim prayer rug is laid out is a mosque?
Currently they have over a hundred real mosques in New York. This site they want now across from where the World Trade Center towers stood, is unfeeling to the 1,000's of relatives of the dead as well as the tens of millions of we Americans who see that ground the same way we see the shrine for the Arizona in Hawaii, hallowed.
Radical Muslims Attacked Our Country and are currently killing our men and women soldiers who have so far kept them at bay from more attacks on US soil. These are facts and most Americans have not and will not forget that. Note, I said radical Muslims and please note if that is just 5% of the total Muslim population we are talking about 75 million radicals who would like to do more harm to the USA and all Judea/Christians.