About the First Amendment:
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.— The First Amendment to the U.S. Constitution
The First Amendment was written because at America's inception, citizens demanded a guarantee of their basic freedoms.
Our blueprint for personal freedom and the hallmark of an open society, the First Amendment protects freedom of speech, press, religion, assembly and petition.
Without the First Amendment, religious minorities could be persecuted, the government might well establish a national religion, protesters could be silenced, the press could not criticize government, and citizens could not mobilize for social change.
When the U.S. Constitution was signed on Sept. 17, 1787, it did not contain the essential freedoms now outlined in the Bill of Rights, because many of the Framers viewed their inclusion as unnecessary. However, after vigorous debate, the Bill of Rights was adopted. The first freedoms guaranteed in this historic document were articulated in the 45 words written by James Madison that we have come to know as the First Amendment.
The Bill of Rights — the first 10 amendments to the Constitution — went into effect on Dec. 15, 1791, when the state of Virginia ratified it, giving the bill the majority of ratifying states required to protect citizens from the power of the federal government.
The First Amendment ensures that "if there is any fixed star in our constitutional constellation, it is that no official, high or petty, can prescribe what shall be orthodox in politics, nationalism, religion, or force citizens to confess by word or act their faith therein," as Justice Robert Jackson wrote in the 1943 case West Virginia v. Barnette.
For more on this subject visit http://www.firstamendmentcenter.org/about.aspx?item=about_firstamd.