“…We have said essentially the following: Government may not act with the purpose of advancing religion, except when forced to do so by the Free Exercise Clause (which is now and then); or when eliminating existing governmental hostility to religion (which exists sometimes); or even when merely accommodating governmentally uninhibited religious practices, except that at some point (it is unclear where) intentional accommodation results in the fostering of religion, which is of course unconstitutional. 41 Justice Rehnquist further added that the purpose prong of the Lemon test is not "a proper interpretation of the Constitution," and has "no basis in the history" of the First Amendment. 42 Rehnquist concluded by saying that the test "has proven mercurial in 39 Ibid., 115.…”