HaKatan, there are many ways to skin this cat, here is a statistical one:
12% of American Jews go to (any kind of) synagogue weekly
25% of Israeli Jews do (32% of those who call themselves “traditional”)
27% of Americans go to religious services weekly.
21% of American Jews say religion is very important
30% of Israeli Jews do, 32% of traditionals do.
you could argue, of course, that given a more religious, and more Jewish, environment in Israel the difference should be larger.
US also had it’s share of Jewish socialists in 1930s and even later who were fighting religion. They simply assimilated and now fight climate change instead of other Jews.
All kiruv work is great, but the number of non-O Jews percentage wise affected by it is very small, and, I think, getting smaller.