More Jews are lost to secular humanism than any other "ism" ; now why would that be and where is the organization to combat Jewish intermarriage ? Face it; in general, only the Orthodox are going to produce more Jews (in the Galut something like 90% survival rate after two generations IIRC). In medinat Israel it is a different matter; there the secular Jews and observant Jews would probably separate into two countries if they did not have so many enemies to force them into a common defense for the most part.
Jews for Judaism and other similar organizations to indeed spend most of their time trying to prevent intermarriage. They’re not primarily websites.
A secular humanist Jew is not lost to the Jewish people the way a Jew who embraces Christianity is.
Yep. Projected demographics don’t look good for non-religious Jews:
http://www.simpletoremember.com/articles/a/WillYourGrandchildrenBeJews/