You don't care about the case law or the Const'n. Hein involved a taxpayer standing case to challenge appropriations made by Bush and now Obama's funding of religious social welfare programs. The term is faith-based. With zero proof that they are more effective than secular programs, the rage is to favor funding of religious programs. There are strict standards for the funding. I know the Court (both sides) mentioned the long-standing Establishment Clause jurisprudence. I've read the case about thirty times. Both the plurality, concurrences, and dissents say what I reported. Taxpayers generally cannot challenge govt. action if the only basis is their status as taxpayers. An exception was carved out for Establishment Clause cases in the famous case of Flast v. Cohen. A much more conservative Court came very close to overruling Flast to hold that taxpayer status was too intangible an injury for Article III jurisdiction. A silly distinction emerged. Flast is now limited to legislative appropriations. Congressional funding is needed. The challenged faith-based programs are funded from discretionary executive branch monies. Since the Flast taxpayer does not exist b/c of lack of Congressional appropriation, the faith based programs are permissible. Every opinion discussed at great lengths the underlying rules for funding. No entanglement by the government, the biggest obstacle to revoking a particular religion's tax exempt status, no endorsement of religion, the extent of government enforcement ( must be minimal but present). Accountability that funds were not diverted to religious purposes. Computers and other items for Roman Catholic schools are iffy b/c a secular use computer can easily become a religious teaching computer.
The basic three-prong test for E C purposes, which came close to be overruled in Hein, remains the basic law for EC violations. It is set forth in Lemon v. Kurtzman and Agostini. These are landmark cases. Findlaw has them. Cornell Law will have them. The Supreme Court may have time.
Mitchell v,. Helms, Bowen v. Kendrick, McCreary County, and Van Orden, while not directly on point, all raise important EC boundaries. The ADL, Freedom from Religion, and ACLU will have them at their websites.
Let us see three years at the 4th ranked law school, graduated with honors, full scholarship, and 25 years of practice. Curious that you think I am a baboon and that you can analyze Supreme Court cases better. One of the problem is beginning law students is that they search for justice/ a greater good and misinterpret cases in this quest. It takes discipline to understand cases. You must know all the points in your opponents' favor.
All the opinions in Hein back my position. I suggest you reread Hein. All of these cases are on FindLaw or Cornell. The basic test is Lemon/Agostini.