[MrB]

Believing a country must act in a certain way because of a certain religion is UnAmerican.

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Do you mean "believing OUR country must..."
And if so, what do you base this assertion on?

[Prokopton]

And if so, what do you base this assertion on?

Based on this assertion by you:

"as a Christian nation, we have a spiritual obligation/charge to defend Israel."

America has no such "spiritual obligation".