So he can read the Seattle Times and discover that the Satanist group is a hate group of other religions. Then from there he can plug in the laws applying to hate groups on public school grounds.
Which laws would designate the Satanic Temple of Seattle as a hate group and deal with such groups on public school grounds?
Pay attention when you read this to the fact that "harm" to a child can be her/his perception that her/his faith is hated, maligned or demonized by a group meeting at their school; pandering to other children in her/his peer group:
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http://blog.seattlepi.com/seattle911/files/library/hate_crime_laws_in_washington.pdf
Washington State has addressed hate crimes through the enactment of a malicious harassment statute...
...directed at crimes and threats motivated by bigotry, prejudice and bias.
A person is guilty of malicious harassment if he or she:
maliciously and intentionally
commits one of
the following acts
because of his or her perception of the victim’s race, color,
religion, ancestry,
national origin, gender, sexual orientation or mental, physical or sensory handicap:
•
Causes physical injury to the victim or another person; or
•
Causes physical damage to or destruction of the property of the victim or another person; or
•
Threatens a specific person or group of people and places that person or members of the specific
group of persons in reasonable fear of harm to person or property.
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What harms an adult is not the same as what harms a child. Children can be permanently wounded by psychological duress. Starting a group on their school campus which touts itself as "the new thing" and this "new thing" exists to demonize that child's family's faith, that child will feel real and proximate shame and harm for having their belief system....and would likely even be ridiculed by peers & influenced (bullied) via peer pressure to abandon that belief system from shame (the stated goal of the Satanists) of not fitting into "the new thing" on campus.
So the Satanists meeing on campus as a de facto "intolerance factory" would be attempting to churn out an environment of intolerance on campus; which would then predictably lead to more bullying. And it would instill a new form of shame in a religious child for simply believing in blind faith and their God. It would open them up to ridicule: since the Satanists themselves are the embodiment of ridiculing organized religion under God.
They could of course try to flip this argument on its head against Christians; claiming the same thing. But Christianity preaches to love the sinners, all of them, but to hate sin (the verb). The Satanists made the fatal legal error of announcing their embodiment and intent was "to teach that other religions are stupid, bad and wrong", generally. Which is bigotry outright. No mincing words here.
In short, the presence of the Satanist group on school grounds, after their clearly enunciated intent, would result in the proximate harm and shaming of religious children attending school. And the Washington law would kick in to prevent real, proximate harm (psychological wounds count where children are involved) to children via hate.