As a side thought, as V pointed out, which God are we talking about?

Is it the Christian God (Jesus)? Certainly not the Jewish God (YHVH). Even less the Moslem God (Allah). Hindus have a bunch of gods. I might be confused to think whether it is Shiva or Vishnu.

Buddhists and Atheists have no God, so they don't count.

The Pledge of Allegiance was originally written by Francis Bellamy, a Baptist minister in 1892. Louis A. Bowman, a chaplain for the Sons of the American Revolution, came up with the idea of "under God". He claimed to have taken it from the Gettysburg address. It was EisenHowar who officially added "under God" after church pastor George MacPherson Docherty convinced Eisenhowar that "under God" was missing in the pledge.

The trend seems clear. The pledge originated, evolved and was enacted as law at the bequest of Christian clergymen. The God in "under God" is the Christian God. In doing so the pledge establishes Christianity as religion. That is in opposition to the First Ammendment, but no lawmaker in the US is going to admit to that because they would be booted out of office by the 75% of Americans who are Christians.

Instead, compromises have been made. Children are not required to say the pledge, even if teachers yell at them that they are unpatriotic. People are required to stand, but they are not required to say anything, or to salute.

I am not a Christian or an American, but there is such a thing as respecting other people's beliefs. If I had to instruct my son, I would tell him to do what he believes is right, and if he disagrees with the pledge, to stand silently and respectfully. If a teacher gave him a hard time, I would go to the teacher and remind them that the law protects people's rights to not say the pledge.