It doesn't expressly say it, but:
The phrase "separation of church and state" is derived from a letter written by President Thomas Jefferson in 1802 to Baptists from Danbury, Connecticut, and published in a Massachusetts newspaper soon thereafter. In that letter, referencing the First Amendment to the United States Constitution, Jefferson writes:
Believing with you that religion is a matter which lies solely between Man & his God, that he owes account to none other for his faith or his worship, that the legitimate powers of government reach actions only, & not opinions, 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.
So, according to one of the founding fathers of America, his interpretation of the first amendment, where it states "make no law respecting an establishment of religion, or prohibiting the free exercise thereof", means that the government will not force religion on anyone. Everyone has the right to believe in or not to believe in whatever God they want to. Places like churches should not be tax exempt corporations. Places like public schools should not be places to hold prayers nor Bible readings.
You should read the wiki, it's pretty interesting.
More information about formatting options