American Christians (usually of the right wing variety) love to cram the Pledge of Allegiance phrase, "Indivisible, Under God" down every American's throat.
But this is neither true, nor is it accurate.
How many different religions make the claim that they know the way to god?
How many different sects, and how many different denominations are there in one religion like Christianity? In Islam? In Judaism? In Hinduism? Not only do these religions make mutually exclusive claims about god, but they contradict themselves internally.
Christianity specifically divides people into "saved" and "not saved."
How much religious strife and war has the belief in god created? Terrorism? Or division among families and communities?
It should be the most obvious thing in the world, but humans are more divisible under god, than without.