Those morons really have no clue about charter schools. Yes, charter schools are funded by taxpayer money, because ............ they are public schools. I won't pretend to speak for other states - though I'm sure many have similar provisions in their state constitutions - but CA has a very clear provision that taxpayer money may not be used in a "sectarian" (= religious) purpose. At. All. (As an aside to any DU-onlurker who may chance to read this post, I'm fine with that provision, and have no desire to weaken or eliminate it) IOW, if XYZ Assembly of God or LMNOP Baptist Church wants to have a charter school, it cannot teach religion as a required class or during normal school hours. And it could not use religious curricular materials such as A Beka or Bob Jones University Press.
Parochial schools are private schools, plain and simple. And somehow, when it comes to tests for college entry - the SAT and ACT - those ignorant knuckle-dragging Catholics' and Fundie-gelicals' private school and homeschool students kick PS students' @$$es. A rational person would think that PS educrats might have a look at those parochial schools and homeschoolers, figure out what they are doing right, and emulate it.
Educrats being but a subspecies of bureaucrat, their response is to try to ban homeschooling outright (they've been smacked down in court, and homeschooling is legal in all 50 states, DC, and US territories) or regulate it out of existence (the courts have smacked down these efforts as well). Were the educrats ever to succeed in banning or driving homeschooling out of existence, private parochial schools would become their next target. Banning private schools or regulating them out of existence would require the overturning of a couple of USSC cases - if they weren't overturned while killing off homeschooling - but the educrats and Christian haters would certainly try, and keep on trying until they succeeded or got decisively smacked down.