@ehBeth,
That's clearly unfair.
In France private schools (often Catholic, but there are also Jewish, Protestant and a few Muslim schools) can opt to sign a contract with the state whereby they get funding in exchange of adhering to the public school curriculum, and submit to regular academic controls. Most do so; only about one thousand schools in the whole country are "
non conventionnées" i.e. out of the state system.
I'm no fan of the Catholic schools and would not send my kids there, but then the French (international) public school we rely onto has an excellent level, which is not the case everywhere, and I must admit that in general the nuns provide quality education. They're not faking it.