It sure sounds to me that folks who hold the belief that the US is a Christian Nation because the majority of the citizens are Christian are both asserting that Christianity is the State Religion and that our form of government is a Democracy rather than a Republic.
Because your group, be it a Religion, a Nationality or a political affiliation, is the majority does not give your group any greater rights, privileges or freedom than a minority .
I have posted this before and I do so again. Freedom of Religion must also mean freedom from Religion. I do not mean as an atheist, but as any other religion who is not the "favored majority".
Jews, Muslims Wiccans, Buddhists, American Indian, Satanists or any other minority Religion should not be required to pay tribute or follow the customs of the majority Religion. Neither, of course, should they be given any special treatment because they are a minority. Note that only Christians, Jews and Muslims believe in the same God referenced in "In God We Trust" or "One nation under God" .
Please note that I am not saying I condone or practice any of these Religions, but as long as they follow the law and do not infringe upon the rights of others, it is their business what they choose to believe.
As an extreme example, let us say we decided to allow the various Religions to take turns referencing their deity in the Pledge of Allegiance.
So, for some period of time, the the Pledge might read "One nation under Satan". As Christians have said, the non-Christians can just not say that part or just not really believe it. I think most folks would find this not acceptable. I do not.
Neither would Buddha, Sun Spirit, Earth Mother or what ever be acceptable. On the same grounds, the deity of the majority faith should not be used in this context either.