That whole “it only applies to Congress” angle is malarkey.
303 Creative v. Elenis: The 1st Amendment bars Colorado from forcing businesses to provide service that goes against their religious beliefs.
Shurtleff v. City of Boston: The City of Boston could not reject flying a Christian flag when it had open many other groups to fly different flags for various occasions.
Kennedy v. Bremerton School District: A school board wrongfully terminated a coach for praying on the field.
These are all recent cases too. Of course, that doesn’t mean they won’t find some different bullshit reason to say this is fine.