I think that Jonathan Tobin misses two points in his post on the “demographic collapse” of non-Orthodox Jewry in the United States. In his concentration on the effects of American Jewry’s success and acceptance in the United States and consequent intermarriage with non-Jews he misses a couple of things. First, most American Jews are Ashkenazic, i.e. descended from Northern and Central European Jews rather than from Southern European, North African, or Middle Eastern Sephardic Jews, and the murder of millions of Ashkenazic Jews by the Germans during the 1930s and 1940s tore the heart out of Ashkenazic Jewry.
When you couple that with the widespread notion that the real place for Jews is Israel, it’s pretty hard to preserve non-Orthodox Judaism in the United States. On the other hand Orthodox Jews have more kids and are much more likely to rear their children in the Jewish faith than non-Orthodox Jews are.
You do realize that the so called “Ashkenazic Jews ” are most likely not ethnically jews at all, in the sense that they ae the descendants of the “Biblical” Jews (i.e., the Jews who lived in the Middle East up till 500BC or so)?
Does it matter?
I do not remember which one of the early books includes it, but one of God’s Laws forbids the Israelites from assimilating into the local culture. Any Jews that follow this will “stick out like a sore thumb”, and it probably explains part of the hatred. When they are successful and wealthy, the 99% phenomenon is usually to blame.