Religious freedom is enshrined in our constitution. I believe that all may believe what they would believe and should worship as they please.
This being said, however, it is a bad idea to put a Mosque near ground zero. After all, it was Jihadist Islamists that committed the horrendous act of plowing airplanes into the twin towers, destroying them and in the process killing themselves and nearly three thousand others. To build a mosque on this site would be seen by many in the Arab world as a victory for the terrorists.
To build this mosque is a slap in the face of the victims families.
Let the mosque be built, but not at ground zero.
Ground Zero mosque debate is about common sense, sensitivity to 9/11 vics, not religious freedom.