Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the Government for a redress of grievances.
Simply put: Our First Amendment, and the first right outlined in our Bill of Rights (same thing) prevents the government from creating laws that establish/require a preference of religion or limiting a citizen’s right to practice any religion.
It also prevents the government from enacting any law that limits our freedom of speech or the freedom of the press to write whatever they want, and it prevents the government from inacting any law that prevents us from assembling for any reason or to petition the government (protest) for any reason.
In other words, as with all of the amendments and the intent of the Bill of Rights, it is a preventive event, not an enabling event. This is often confused. The Bill of Rights and subsequent amendments define what the government can and cannot do, not what citizens can or must do. We do not have to speak out or protest or write stuff, but we can if we want. The government, on the other hand, cannot pass any law that prevents us from doing these things.
We have plenty of examples of countries that do limit these rights. China, North Korea, Iran etc. all use the government to suppress the population from speaking, writing, worshiping or
gathering.
This amendment is where the concept of ‘separation of church and state’ come from. Nowhere in the Bill of Rights will you find that phrase, it was written by Thomas Jefferson in a letter to the Danbury Baptists Association in which he wrote "...I contemplate with sovereign reverence that act of the whole American people which declared that their legislature should 'make no law respecting an establishment of religion, or prohibiting the free exercise thereof,' thus building a wall of separation between Church & State” to assure them that the Constitution would reach the state level. The statement ‘separation of church and state’ does not appear in our constitution anywhere.
It does not seem to dictate that the government cannot have a Christmas tree in an office somewhere, just that it can’t pass a law that requires a Christmas tree. This has been challenged and reinterpreted over the years to the point of complete lunacy.
So, we have the right to establish and practice any or no religion, we have the right to say or write what we want and we have the right to get together and talk about whatever and whomever we want. Easy!
Or not… The nuances in this one are very far reaching. For example, does the first amendment give a citizen the right to tell a foreign country a secret? Does it give the right to a citizen to print an offensive and completely made-up story about his neighbor in the paper? If not, can the government pass a law stating that you can’t do these things? If it does, isn’t that prevented by this amendment?
This is why we have the Supreme Court, of course. Their job is to interpret and decide what the original intent of any particular amendment was in an attempt to clear things up. In the early 1900’s the Supreme Court established a test called ‘clear and present danger’ Justice Oliver Wendell Holmes, Jr., writing for the Court, explained that "the question in every case is whether the words used are used in such circumstances and are of such a nature as to create a clear and present danger that they will bring about the substantive evils that Congress has a right to prevent"
Clear? It seems that the first amendment is not absolute, and it really shouldn’t be. The basic test seems to be that the government cannot prevent you from doing these things unless it is shown to infringe on someone else’s rights. Case law is full of interpretations and challenges
to the first amendment, and the Supreme Court, as is their job, has ruled numerous times to define and refine the meaning and scope of the constitution.