From what I have been able to piece together about Germans (my wife lived there and we have had several au pairs from there), they don’t understand the situation with religion in America. In Germany, people gradually stopped participating in organized religion, but the social framework has remained largely intact. Last I checked, German public schools are still required to offer religious education under Article 7-3 of the Basic Law.[1]
In the US, secularists have made a concerted effort to scrub every trace of religion out of public life and impose French-style secularism on a country that’s as religious as Poland. And they did that not in the 21st century, but in the 1960s and 1970s, when both Germany and the United States were vastly more religious.
Folks who want to homeschool their kids for religious reasons aren’t the nuts that American media makes them out to be. They’re people who in Germany or Sweden or the Netherlands or many other places would be able to avail themselves of public options that those countries include in the mainstream.
[1] Germany appears much more content to let social mores evolve organically rather than tearing up the social fabric by rushing change. Germany is a much more liberal country than America, but the laws are much more conservative in many ways. A subset of Americans are besides themselves because the Supreme Court overturned a case recognizing a right to abortion until viability (22 weeks). Meanwhile, Schwangerschaftsabbruch I (deeming abortion to be a violation of the Basic Law’s right to life) is still the law in Germany, and decriminalized abortion is permissible only to 12 weeks. Nobody called Angela Merkel a fascist for voting against same sex marriage. Bavaria requires crosses in public buildings and hasn’t been kicked out of the country. Etc.