I don't care how you try to defend it, "under God" simply has to go. It amounts to no less than the tyranny of monotheistic religious beliefs over the goal of a free thinking, truth seeking society. Future generations will look back on this sad phenomenon with embarrassment and shame, and the longer we perpetuate this absolute nonsense, the further we deepen this shame.
Printing "in God we trust" on a nation's currency is no more appropriate than printing "in evolution we trust" on it - and the principle of evolution is widely regarded as a scientifically established fact while the belief in a supreme, omnescient, omnipotent being is widely regarded as a faith - one could even say an elaborate superstition.
Making bold claims of being one nation "under God", or "in God we trust" is some kind of wishful thinking. As if - while we know it simply isn't so - that somehow saying it will magically make it so. Never mind the fact that this whole debacle violates the constitutional principle of the separation of church and state by endorsing a monotheistic religious belief. That's just so obvious, I needn't even waste time going into that.
In fact, we're so far from being one nation "under God", that incorporating this bombastic language into articles of government amounts to a kind of false advertising. Like, the further the nation deviates from godliness, the louder the marketing message that says this is a righteous nation of honest God-fearing folks. We conduct ourselves as though we're making some bold claim on morality. It's just downright self-righteous piety.