I only want to make one point which is relevant to Jews and non-Jews: nearly everywhere I look I see non-orthodox synagogues failing, for sale or barely hanging on. I see exceptions too.
The one significant phenomenon I want to point out that I see around me, in urban areas, is the development of the new informal shul. In San Francisco the biggest gathering of Jews I know of is call the Mission Minyan. Hundreds of people attend weekly with no rabbi, no formal structure and most importantly: No Judgment. Some people walk to services, some stay for the whole service, others drive and stay for part, some are kosher, some only avoid pork and shrimp, others are not kosher.
I watched the entire mainstream of Christianity nearly disappear from 1960 to 1970 as the Lutheran, Methodist and Presbyterian churches began to demand anti-Vietnam-War politics as a religious dogma.
The same seems to be happening in modern American Judaism. Only the new informal, tolerant shul, will provide a home for the non-orthodox who aren't political Lefties.