And if a civic action depended on your belief in gravity, which was a belief the government did not share, then this would be relevant.

There are plenty of lines around what rights a genuinely held belief entitles you to. What the parent is saying is that there is no line between religious and other deeply-held beliefs.

You draw the line at taxes.

> Members of certain religious groups (including the Amish and Mennonites) may be exempt from paying Social Security taxes. To become exempt, they must:

> Be a member of a religious sect that makes a reasonable provision of food, shelter and medical care for its dependent members and has done so continuously since December 31, 1950;

https://faq.ssa.gov/en-us/Topic/article/KA-02411

There is endless jurisprudence on this topic. Basically the government draws the line at where your beliefs affect others and there are different levels of urgency the government must show to trample on religious rights depending on the risk to the counterparty.