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@oromagi
Any law making people recite an affirmation of a single, present deity is a clear violation of the First Amendment. Better to toss that silly pledge written by a newspaper out the window and if any pledge seems necessary, write one that adheres more closely to the spirit of our Constitution.
The words "under God" were added to the pledge of allegiance during the Cold War to distinguish the United States from the Soviet Union. It was, oddly enough, during that same time that the United States' closest alliances with the Muslim world were formed.
The idea was, from the Capitol to the CIA, that the Christian West and Muslim East shared a common opposition to godless, atheistic communism that was as destructive to Christianity as it was to Islam. As "men of the book," their interests in preventing their religion from being driven from this earth was shared and existential. That was at least the thinking in Washington, Riyadh and Tehran at the time. Strange to conceive of all three as allies now, but once we were all on the same team.
That being said, the United States does not compel its citizens' allegiance any more than it compels recitation of any pledge. You do not have to say the pledge. Laws requiring any compelled speech are themselves unconstitutional, not for violating the establishment or free exercise clauses; but for intruding onto the domain of free thought (i.e., the principle behind each of the rights protected by the First Amendment). So your point is moot. There is no law compelling anyone to recite the pledge of allegiance. You can do it. Or not. It is your choice. The government cannot compel you to do otherwise.