Separation of church and state is a bedrock principle of our Constitution much like the principles of separation of powers and checks and balances. In the Constitution, the founders did not simply say in so many words that there should be separation of powers and checks and balances; rather, they actually separated the powers of government among three branches and established checks and balances. Similarly, they did not merely say there should be separation of church and state; rather, they actually separated them by (1) establishing a secular government on the power of "We the people" (not a deity), (2) according that government limited, enumerated powers, (3) saying nothing to connect that government to god(s) or religion, (4) saying nothing to give that government power over matters of god(s) or religion, and (5), indeed, saying nothing substantive about god(s) or religion at all except in a provision precluding any religious test for public office. Given the norms of the day (by which governments generally were grounded in some appeal to god(s)), the founders' avoidance of any expression in the Constitution suggesting that the government is somehow based on any religious belief was quite a remarkable and plainly intentional choice. They later buttressed this separation of government and religion with the First Amendment, which affirmatively constrains the government from undertaking to establish religion or prohibit individuals from freely exercising their religions. The basic principle, thus, rests on much more than just the First Amendment.
That the phrase "separation of church and state" does not appear in the text of the Constitution assumes much importance, it seems, to some who mistakenly supposed it was there and, upon learning of their error, reckon they’ve solved a Constitutional mystery. To those familiar with the Constitution, the absence of the metaphor commonly used to name one of its principles is no more consequential than the absence of other phrases (e.g., Bill of Rights, separation of powers, checks and balances, fair trial, religious liberty) used to describe other undoubted Constitutional principles.
To the extent that some nonetheless would like confirmation--in those very words--of the founders' intent to separate government and religion, Madison and Jefferson supplied it. Some try to pass off the Supreme Court’s decision in Everson v. Board of Education as simply a misreading of Jefferson’s letter to the Danbury Baptists–as if that were the only basis of the Court’s decision. Instructive as that letter is, it played but a small part in the Court’s decision. Rather, the Court discussed the historical context in which the Constitution and First Amendment were drafted, noting the expressed understanding of Madison perhaps even more than Jefferson, and only after concluding its analysis and stating its conclusion did the Court refer–once–to Jefferson’s letter, largely to borrow his famous metaphor as a clever label or summary of its conclusion. The notion, often heard, that the Court rested its decision solely or largely on that letter is simply wrong.
Madison, who had a central role in drafting the Constitution and the First Amendment, confirmed that he understood them to “[s]trongly guard[] . . . the separation between Religion and Government.” Madison, Detached Memoranda (~1820). Indeed, he understood the original Constitution--without the First Amendment--to separate religion and government. He made plain, too, that they guarded against more than just laws creating state sponsored churches or imposing a state religion. Mindful that even as new principles are proclaimed, old habits die hard and citizens and politicians could tend to entangle government and religion (e.g., “the appointment of chaplains to the two houses of Congress” and “for the army and navy” and “[r]eligious proclamations by the Executive recommending thanksgivings and fasts"), he considered the question whether these actions were “consistent with the Constitution, and with the pure principle of religious freedom” and responded: “In strictness the answer on both points must be in the negative. The Constitution of the United States forbids everything like an establishment of a national religion.”
While the First Amendment undoubtedly was intended to preclude the government from establishing a national religion as you note, that was hardly the limit of its intended scope. The first Congress debated and rejected just such a narrow provision (“no religion shall be established by law, nor shall the equal rights of conscience be infringed") and ultimately chose the more broadly phrased prohibition now found in the Amendment. During his presidency, Madison vetoed two bills, neither of which would form a national religion or compel observance of any religion, on the ground that they were contrary to the establishment clause. While some in Congress expressed surprise that the Constitution prohibited Congress from incorporating a church in the town of Alexandria in the District of Columbia or granting land to a church in the Mississippi Territory, Congress upheld both vetoes. Separation of church and state is hardly a new invention of modern courts. In keeping with the Amendment’s terms and legislative history and other evidence, the courts have wisely interpreted it to restrict the government from taking steps that could establish religion de facto as well as de jure. Were the Amendment interpreted merely to preclude government from enacting a statute formally establishing a state church, the intent of the Amendment could easily be circumvented by government doing all sorts of things to promote this or that religion–stopping just short of cutting a ribbon to open its new church.
The Constitution, including particularly the First Amendment, embodies the simple, just idea that each of us should be free to exercise his or her religious views without expecting that the government will endorse or promote those views and without fearing that the government will endorse or promote the religious views of others. By keeping government and religion separate, the establishment clause serves to protect the freedom of all to exercise their religion. Reasonable people may differ, of course, on how these principles should be applied in particular situations, but the principles are hardly to be doubted. Moreover, they are good, sound principles that should be nurtured and defended, not attacked. Efforts to undercut our secular government by somehow merging or infusing it with religion should be resisted by every patriot.
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