Yes, our country has become more multi-cultural. But that is not the crux of the problem. The real difficulty that the Court has with the First Amendment is that it was written for a free people, governed by a strictly limited Congress. The Founders never envisioned a Federal Government whose taxation and spending penetrated the daily fabric of life. Every social program today is a combination of taxation followed by government spending.
Time is money.
Free exercise is unavoidably diminished by this amount. Even worse, the Government-provided surrogate teachers in the government schools at best pass on mixed signals, and at worst flatly contradict the precepts taught by the parents. This is NOT free exercise of religion. The Constitution is NOT being upheld. It is a fine kettle of fish we find this country in.