I beg to differ-
1.There have been more than 'just one rep' that has done this. A judge in NC has allowed witnesses to swear an oath on this book. M. Osman Siddique, the first Muslim ambassador in U.S. history, was sworn in on a Koran in 1999, when he became U.S. Ambassador to the Fiji Islands, and I seem to recall a CA rep doing the same thing.
2.You may want to call it freedom of speech, but I prefer to call it spitting in the face of American culture.
It must be nice to have so few worries in your life that you can obsess about things that really aren’t of much consequence.