Actually the Anglo-American political and legal traditions are based on a Xtian understanding of Tanach. All of the British and American philosophers were lovers of Tanach. John Selden even learned from Rabbi Menashe ben Yisrael. Atthe time ofthe Revolution every American college required students to learn Tanach in the original Hebrew (Madison, BTW, was fluent in the language). The argument over slavery was largely an argument between Protestant missionaries over the Tanach’s attitude towards the peculiar institution in general and black slavery (because of Ham’s curse) in particular.
I personally have no problem with this. A Xtian America would be much better for Israel (as well as Jews in America) than a secular America. Personally though, I am hoping that the interface with Islam will bring both closer to the sheva mitzvot.