Is this the most recent poll you could find? I‘m pretty sure support for Israel has drastically dropped over the year since this poll was published.
Here is one a year later from the same publisher: https://news.gallup.com/poll/657404/less-half-sympathetic-to...
33% are sympathetic to Palestinians vs. 46% who are more sympathetic to Israel. Support for Israel is the lowest since they started measuring in 2001 and is showing a pretty rapid decline. Among democratic voters Palestine support is actually greater than support for Israel (59% vs 21%). Among the youngest age group (18-34 years old) support is 48% for Palestine vs 31% for Israel.
The takeaway isn’t just the shifting demography it is also a shift in support. More Americans are changing their opinion, away from Israel and towards Palestine. Especially among the Democratic voter base.