Technically, the book is right. But the motives of the book's publisher are clearly suspect, and have a political overtone.
Some facts here:
First, "Palestine" to the best of my knowledge derives from the term "Philistines" which we all know were a brutish lout of people living along the coast of what is modern-day Israel and Gaza. Jesus was not a Philistine. Neither are today's Palestinians proven to be descended from Philistines.
Second, historical Palestine extends from Lebanon and Syria to Egypt and the Sinai, and even into modern-day Jordan. So, technically speaking, anyone living in these areas could be considered Palestinian.
Third, today's Palestinians weren't even called Palestinians UNTIL they fled Israel proper prior to the 1948 war. The name was absconded in an attempt to add legitimacy to the refugees. No one in all Araby gave a hoot about them until they because useful fodder and political pawns, and they had to give them a name. The Jews called themselves Israelis, so the world named the refugees Palestinians.
Fourth, Jesus was Jew, a Hebrew, and clearly not a Gentile, which is the inference of the text.
So why do I provide all this information? To show that the textbook in question is one more example of an arrogant leftist trying to use half-truths to indoctrinate our children. Even if means implying that Jesus was a Palestinian, meaning that "What Would Jesus Do?" means Jesus would side with today's Palestinians instead of today's Israelis.
Sheesh. Repeat after me until you're numb: home school or Christian school, home school or Christian school, home school or Christian school, home school or Christian school ...
Footnote: I've always thought it appropriate that today's Palestinians, loved by so many on the political left, claim descent from the very people whose name (Philistine) has such a pejorative connotation -- someone who is without culture, without class, base and loathsome. Sounds just like ... well ... just like the former leader of the Palestinians, Yassir Arafat!