There’s a NY Times article about how Judaism sucks. The reporter doesn’t actually use the word “sucks,” but that’s the best adjective.
As the article points out, Judaism is based around the assumption that Hebrew is a holy language, and the only correct way to practice Judaism is to recite prayers in Hebrew. And I can tell you that the congregation is probably divided between half who know how to pronounce Hebrew and half who don’t, and 1% who actually understand Hebrew and might be able to have a conversation in Hebrew. Except for any Israelis who happen to be in the congregation, because as you know, Israel successfully resurrected the dead language of Hebrew. But in America, no one besides crazy religious nuts like the ultra-Orthodox have the time or inclination to put in the effort to learn a language with no practical benefits outside of qualifying to become a rabbi. Even within the religion, there are no practical benefits, because synagogues don’t expect anyone to be able to understand Hebrew, they only expect members of the congregation to be able to pronounce it and chant.
All successful religions have prayer and services in the actual language that people of the nation speak. That’s why religions like Mormonism and evangelical Christianity are growing. Catholicism in the United States, which still uses some Latin and like Judaism has lots of rituals that no one understands, is at best fighting a holding action and relying upon Hispanic immigration to increase its ranks rather than by converting anyone.
I predict that the people who control Judaism will not be able to change in time to prevent the religion from dying out in the United States among all but the ultra-Orthodox and Hasidim.