I have heard this mantra, or something similar, repeated many times in recent days: "The US is founded on Christian Principles"
Now, I have read the US Constitution many times. I have taken a Constitutional law course. I have even waded through some of "The common law". And I cannot for the life of me figure out what this phrase is supposed to mean.
As far as I can tell, there are no Christian principles in the US Constitution, with the possible exception of the endorsement of slavery.
I understand that the people making these statements really aren't even trying to do an analysis, its just something they think sounds good. But is there even the remotest shred of evidence behind this claim?
You are correct, it is a big lie and some clever revisionist history.
While the Wiki entry's neutrality is disputed, the following still depicts real events that are relative to the OP.
Evangelicalism
WP
....Roe v Wade, the Supreme Court decision rendered in 1973 preventing states from making laws that prohibit abortion, is the most prominent landmark of a new era of conservative evangelical political action, unprecedented in its intensity and coordination. ...
"Abortion and homosexuality are sins" is typical of the rallying cry. There is some dispute as to what role the revocation of a certain tax exempt status for religious institutions which discriminated in hiring practices played as the actual underlying political catalyst and whether or not the anti-abortion issue was merely a political ploy to rally the troops round the wagons. Regardless, that is the current catalyst for the movement. That and the well worn but continually successful, "Christians are persecuted" rally cry, that is.
The mass-appeal of the Christian right in the so-called red states, and its success in rallying resistance to certain social agendas, is sometimes alleged as an attempt to impose theocracy on an otherwise and secular society.[14] There are indications that the belief is widespread among conservative evangelicals in the USA that Christianity should enjoy a privileged place in American public life according its importance in American life and history.[15] Accordingly, those evangelicals often strenuously oppose the expression of other faiths in schools or in the course of civic functions. For example, when Venkatachalapathi Samuldrala became the first Hindu priest to offer an invocation before Congress in 2000, the September 21 edition of the online publication operated by the Family Research Council, Culture Facts, raised objection:
"While it is true that the United States of America was founded on the sacred principle of religious freedom for all, that liberty was never intended to exalt other religions to the level that Christianity holds in our country's heritage. The USA's founders expected that Christianity--and no other religion--would receive support from the government as long as that support did not violate peoples' consciences and their right to worship. They would have found utterly incredible the idea that all religions, including paganism, be treated with equal deference."
My personal assessment is that a number of power seeking men (sorry guys, point out the power seeking evangelical ladies and I'll modify my position) have simply seized on this theme to promote their own positions of perceived importance. In doing so they have built a mini empire of political strategists, political leaders in the Republican Party, well financed organizations seeking to influence political decisions such as the Discovery Institute and the Heritage Foundation, (a marriage of religious and financial motive interests), and a base of followers ready to support these men on their personal quests for power and influence.
The Falwells and the Dobsons nourished their egos on this damaging movement. It snowballed into the Neocon, right wing, Evangelical, anti-science, anti-gay, anti-abortion, pro-your 'personal experience with Jesus' and 'waiting for the rapture' movement we see today. Cheney, Rove, and all the rest of the Bushies including GW have used this "base" to propel their own political power grabs with varying degrees of Evangelical convictions but certainly no qualms about sucking up to these believers. Of course McCain can't seem to quit them. He also seems to have no qualms sucking up now, despite previous claims of not being one of them in the past.
This is not to say all believers and all Republicans are part of this travesty. Unfortunately only recently have many Evangelicals begun questioning the notion, "the environment be damned, we'll be raptured before it matters". And it seems that, publicly anyway, only recently are many Evangelicals are beginning to recognize human rights abuses are much more atrocious sins than being gay.
Many Republicans are finally having a hard time with GW's f***** up war policies and outrageously wasteful and corrupt spending on that war. Even hard core right wingers must have at least been shocked, if not outraged at the aftermath of Katrina and Bush's, "Heck of a job Brownie" comments. Though I think it is still a tad too easy for those hard right wingers to buy the lie that people didn't leave when they could have. No transportation, no place to go is easily forgotten or disbelieved. I can't help thinking some of them must be thinking, Katrina could have happened to them.
Well, that's my perception of the claims we were originally a "Christian Nation".