It sounds like you have a beef with how citizens socialize their children into the dominant religion of the society—which is literally considered a human right[1]—and less so with how schools are funded in the U.S.
See Article 18.4 of the International Covenant on Civil and Political Rights: https://www.ohchr.org/en/instruments-mechanisms/instruments/... (“The States Parties to the present Covenant undertake to have respect for the liberty of parents and, when applicable, legal guardians to ensure the religious and moral education of their children in conformity with their own convictions.”)
American subgroups that socialize their children into community religious norms are among the most successful. For example, Mormons: https://americanaffairsjournal.org/2020/11/utahs-economic-ex....
Prohibitions on religious education in public schools—which don’t exist in many developed countries, such as Germany and Sweden—hurts the majority of people who would do better under that system.
