If a child attends a school district which starts the day with the Pledge of Allegiance, between 1st and 12th grade, that child will have recited it over 2,000 times.
Well before graduation, they won't be thinking about what they're reciting. They'll be simply repeating it by rote. The US Supreme Court majority basically said as much when they upheld "under God". They said people recite it so often that it is simply stated without most children really thinking about it. The US Supreme Court essentially used the same argument about the phrase "In God We Trust" on our money. It's seen so often, people don't think about it. It's just part of the background.
I'd think true believers in God would be disturbed by those notions.