When this country was founded, there had been no other nation in history with such a distinct separation of church and state. The founding fathers were largely religious men and used sound morality to guide them, but the US was far more influenced by philosophers of the time than the Bible. The US never has been a nation of God or Christianity.
I pledge allegiance, to the flag, of the united states of America, and to the republic for which it stands, one nation, under god, indivisible, for liberty and justice for all.
Not in the Constitution.
Also, under God is a vague term as God is interpreted in many different ways to many different people, thus it is open for interpretation.
It doesn’t mean God, like there is only one God. It assumes that all people are of A religion. Not all people are Christian. It means under ‘whoever your god(s) may be.’