wrenching this back to the OP, I believe that the quote given + source (ACLU) was attempting to point out to those who support vouchers (believed to be mostly Conservative white Christians - at least in my state of MIchigan that certainly followed - ie when vouchers were again on the ballot recently, the funding came from the Grand Rapids Bible Belt and the proposal had the most support over there and the least support in D-troit) that once you’ve opened the door to school vouchers for religous based schools, you cannot deny them to religions you don’t find comfortable.
my little area of Mi (the capital) has a whole host of ‘alternative’ schools - mostly charters. There’s a Catholic school, a Montesorri school, an Edison project school, a Lutheran school, a large ‘alternative’ school, and even an Afro Centric school or two.
after a couple of years, we’ve found - all but two of the schools have dropped middle /high school levels, the largest that is still doing all levels has cuts looming of 25% of it’s budget. Interestingly enough, the local paper did a project, asking several schools some basic pieces of information (what was their enrollment, average level of education for it’s teachers, salary rates for teachers, it’s ‘plan’ - a state mandated thing, and several other things). The public schools (in particular the inner city one) answered w/in short time, others needed several prods, including a letter stating that the info was part of the Freedom of Information Act, and two (both charters) refused outright, even after being told that it fell under the FOIA.
the governing body for many of the charters were out of area groups who operated on a lessez faire approach, sometimes with disasterous results (one of the charter schools is near bankrupcy, has gone through more than one principal in a year, the last one was arrested at the school on an outstanding drug warrant).
IN the meantime, the public schools (who would have had those students and the funding therein) has had to struggle w/budgeting problems.
Having watched how these charters operated, I’m not at all convinced that vouchers will improve the situation. At least w/the public schools, the public has a board they elected and can address how their tax $$ are spent and accounted for. I’m not able to go to the charter’s board and make a case, even if it’s my tax $$ supporting them.