I’ve heard the argument a gazillion times that the “God” in the Pledge of Alligence could mean any god or religion. And, I’ve heard many times as well the “higher power” referred to in Alcholics Annonomous could refer to not a god but anything else bigger than oneself.
An increasing percentage of Americans do not believe in higher powers of any kind. This group may not want their children to have the schools’ authority figures, teachers, standing in front of the children receiting a pledge of “one nation, under God,…”
At home, the parents are trying to teach their children there is no such thing as a god or higher power. The school, supported be their tax dollars, is undercutting their family values.
Technically, children are not required say the Pledge. Some argue they could just ignore it. That is called the “divert-your-eyes” argument used by those defending Ten Commandments on public property
A series of court decisions have done away with divert-your-eyes. That is, tax dollars cannot be used to advocate one religion over another even if people have the right to ignore it.
If we take the Ten Commandments court decisions and apply them to “under God” in the Pledge it would seem to make it unconstitutional. But, courts have not seen many cases about “under God” yet so where it it headed we don’t know.