You know, what the Constitution's rooted in.
It's like pointing out the awesome influence the Bhagavad Gita had on Maya Angelou, or, alhamdulillah, the huge numbers of words that alarabiyya has contribed to modern Amrika English. (I mean, there are wanderworter, like algebra, but those are hardly hadith.
Any more than Russian so vliyaled English to make dear old Fyodor Mikhailovich a standard imya-otchestvo recognizable to all.
My militantly atheist Russian lit teacher had one word of advice on the first day of grad school: By the end of year 1, we should all have read at the very least the NT in Russian and, if at all possible, a second time in Church Slavic. Even if we didn't focus on 19th century literature, the secular language was full of expressions and allusions. Same for a lot of American lit.
Later we found that a nice set of sermons and some Old Russian chronicles would help. But there's a reason that even Hunt for Red October began not with a quote in Russian but in Church Slavic.
Now, the Qur'an and ahadith, Bhagavad Gita, the Vedas, the Analects, all kinds of other things ... Not so important. Unless you have trouble accepting that a different culture doesn't make each person's culture the center of its universe.