Expand on this.
Do you mean that we might not be able to know everything? Why does that matter?
Am I to assume that you have dropped the points that I keep asking about?
So, the Mormon and Catholic that brought that case to the courts believe that religion is inherently insulting?
Sorry, not buying it.
The implication should be that there are many people, atheist, christian, pagan, etc. That don't believe it is the governments business setting a religion that is more acceptable than any other, it is not that they believe religion is insulting but that it is a Personal and Private matter.
Yes it has been refined. The supreme court treats the constitution as a frame work that is to be expanded and adapted as time changes, thus it can out last the centuries.
"[The supreme court]functions as guardian and interpreter of the Constitution"
"As Chief Justice Marshall noted in McCulloch v. Maryland, a constitution that attempted to detail every aspect of its own application would partake of the prolixity of a legal code, and could scarcely be embraced
by the human mind. . . . Its nature, therefore, requires that only its great outlines should be marked, its important objects designated, and the minor ingredients which compose those objects be deduced from the nature of the objects themselves. " "Chief Justice Marshall expressed the challenge which the Supreme Court faces in maintaining free government by noting: We must never forget that it is a constitution we are expounding . . . intended to endure for ages to come, and consequently, to be adapted to the various crises of human affairs. "
http://www.supremecourtus.gov/about/constitutional.pdf
Yes, the establisment clause has been refined,
A few examples of court rulings that have refined it,
The lemon test. Lemon V. Kurtzman,
http://en.wikipedia.org/wiki/Lemon_test
Santa Fe Independent School Dist. v. Doe
http://en.wikipedia.org/wiki/Santa_Fe_Independent_School_Dist._v._Doe
Board of Education of Kiryas Joel Village School v. Grumet
http://religiousfreedom.lib.virginia.edu/court/boar_v_grum.html