The reference was to the Constitution, not the Declaration of Independence. The DoI was, in essense, a well-crafted "neener-neener," while the Constitution set out what kind of nation this was to be. The Constitution makes no reference to God, and is quite agnostic on the topic.
Atheism is not agnosticism. Atheism is a belief that there is no God.
Incorrect.
Here's documentation:
From the Quinlan decision by the New Jersey Supreme Court
""n1 The importance of the preservation of life is memorialized in various organic documents. The Declaration of Independence states as self-evident truths "that all men * * * are endowed by their Creator with certain unalienable Rights, that among these are Life, Liberty and the pursuit of Happiness." This ideal is inherent in the Constitution of the United States. It is explicitly recognized in our Constitution of 1947 which provides for "certain natural and unalienable rights, among which are those of enjoying and defending life * * *." N.J. Const. (1947), Art. I, par. 1. Our State government is established to protect such rights, N.J. Const. (1947), Art. I, par. 2, and, acting through the Attorney General (N.J.S.A. 52:17A-4(h)), it enforces them""
Posted at http://academic.udayton.edu/LawrenceUlrich/quinlan.htm