I have, in the main, seen two reaction to the Ground Zero Mosque. The conservatives, generally more security-minded than liberals, are aware of the triumphalist message this sends to people who endorsed, applauded, or otherwise expressed sympathies with the 9/11 attacks against America, a group that reportedly includes the intended imam of the proposed mosque. The liberals, generally more multi-cultural minded than conservatives, want to send a welcoming message -- one that makes it clear that such attacks are not necessary because we in America mean no harm to the Muslim world, and that we can overlook the people who sympathize with that type of attack in order to welcome the Muslim community at large.
Both of those political responses have components of Christian thought in them. The liberals have tended towards love for enemies (though possibly at the expense of love for neighbor, if the neighbors are the thousands of families who lost loved ones to terrorist attacks that day, or simply people who do not feel safe with a religious leader who reportedly expressed some sympathies with those attacks setting up camp a stone's throw away). The conservatives have tended towards love for neighbor (though, as far as I can tell, without any recognition that love for enemies should factor into the thinking, or that American Muslim communities include many people who do not, at the present time, endorse attacking America and have not joined the call for open military jihad against us).
It's tempting to get wrapped up in the political and secular end of the question. If I had been a Muslim, good conscience would forbid me to ever set foot in the Ground Zero Mosque because it would give the appearance of endorsing terrorist attacks. This does not seem to be a concern in the Muslim community. I can't imagine Germans building a business-as-usual government building next to the remains of Auschwitz, or the U.S. building a "military technology" museum at Hiroshima. So I do think that, regardless of our own personal reactions to the mosque, we need to notice the lack of that kind of outcry in the Muslim community. What happened at Ground Zero should make them want to reject that site for "business as usual" for their own reasons, if they do not intend to endorse what happened there. It is one thing to debate whether the New Yorkers have a right to object; but like Sherlock Holmes and the dog barking in the night, it is easy to overlook what you're not hearing. A group opposed to what happened there would not want to build a mosque there if they saw that place as the ultimate shame of their religion, that their co-religionists perpetrated such an outrage against humanity. A group that was solidly opposed to what happened there would have its own people screaming out in protest at the choice of the site. The Muslim community knows how to do a protest; why is this passing in relative silence?
But it is at times like this, when the political stakes look to be very high, that it is tempting to stay on that level. As far as the U.S. reaction goes, none of it is surprising. After all, "liberal" and "conservative" are primarily political or ideological identifications, not religious ones and not specifically Christian ones. So the risk is, when the political and ideological stakes are that high, that we lose our specifically Christian identities. We cease being primarily followers of Christ and end up becoming partisans tossed about by every wind of current events. As Christians, we love our neighbors -- and want to keep them safe, and want to heal their wounds. As Christians, we love our enemies -- not just the "safe" ones who don't sympathize with terrorists, either. Most of the political groups are already missing one or the other of those. But the missing piece: as Christians, we proclaim Jesus as the true way to God. No one who takes Jesus' words to heart can endorse a terrorist attack; it is impossible.
Friends, if we really want everyone to live together in peace, the name of Christ is the only thing that will do it. Secularism and goodwill aren't actually strong enough for the job. And regardless of whether we are granted times of peace or not, the love of God in Christ is our message. The politically-minded will see this as hopelessly naive. I suppose we're even; I see faith in politics as hopelessly naive. There is no political answer for how to turn a terrorist into a friend; terrorists either die or become oppressors, unless they have a change of heart so that their hatred dies. Christ is that change of heart. We fail to recognize that at our own risk.