Last summer, when my teenager checked in for a flight they asked him lots of questions. First question, Do you go to hebrew school?
Answer Yes. When they started speaking to him in hebrew, and he didn't understand...(some of you know what i mean), it raised a red flag.

Also, my Rabbi didn't have his keepa (skullcap) on when he checked in once. Security couldn't understand why a Rabbi...

The article was very detailed, or as detailed as was allowed by El Al security.
All check-in agents are former Army folks and very well trained.
If you sat alone, or sat next to someone who appeared to know a little about you...looks as if they were a bit concerned about you. I guess they don't know about flyertalk!

dan