Wonder how the Saudis would have reacted if the parishioners had turned tables and begun recording the Saudis with smart phones.
Since they were strangers in a foreign country they would have said/done nothing. The KSA has no "tourist" visa so you would have never seen that there.
They aren't stupid and do know how to behave in a Christian country. If they misbehave and people KNOW that they are Saudis, they just MIGHT get themselves punched out.
However, EVERY country, culture, ethnicity and faith has its share of jerks, boobs and morons, so one would HOPE that said moron's friends would keep him in line.