I'm not the first person to make this point, but it's something that every time I hear it, I get a similar reaction to "eat ze bugs".
When everyone on the internet describes their stuff as "content" or other things as content. Like "Wow Nintendo just announced a bunch of new content coming for [insert thing]"
What a bland revolting consumerist phrase. I wish the term "content" was banned from the English language unless you're describing the content of someone's character.
When you say they have a good content of character, it's a fine word.
But when you describe art, entertainment, or videos as that way you couldn't pick a more soul-less word, and they're choosing it for themselves.
Something doesn't have to be high art in order to not be called content. The weather channel is pretty dry stuff, but they don't open up the show by going "hi here's our weather content for the day". It really is like something a dystopian society would say.
They say "Good morning everyone, glad to have you back. Let's look at how the weather is going to look like today". Or I assume that's along the lines of what they say. I haven't seen a weather channel in many years.
Anyways, mini rant, had to get it off my chest.
I would argue the average pew-sitter doesn't really know the Bible and doesn't really understand the throughline the generations to Jesus, or know about the Tabernacle and the various parts and roles of that system and how Jesus fulfills the day of Atonement.
I don't think the average "just goes to church because that's what they're supposed to do" person thinks much one way or the other theologically about Jews.
Now there is a group who I think is totally off base who do fit your view, but I don't think they're the average; I think they're a smaller amount than people would think who donate to the third temple being built and help Jews out without preaching to them repentance because they think they're supposed to help Jews for blessings and never criticize them.
I tell those people, you're just aiding the Jews deception. Every cent you give to getting the third temple built is telling Jews "Even we Christians believe the temple sacrifices will cleanse you of your sin". It's wrong that Christians do it. And it's not a thing of faith to do that, to try to "speed up" prophecy. The third temple will be built no matter what because it's been prophecised.
So those people you describe do exist but I don't think they're the average Christian, and they seemingly haven't thought deeply about the implications of what they're doing when trying to aid Israel to build the temple.