Speaking as a Catholic married to a (non-observant) Jew, I agree with your observation. My sister-in-law is a Messianic Jew (Jews for Jesus) married to a Baptist, my wife's best friend is a Jewish woman who married an Italian guy. Another friend is a Italian woman married to a Jewish guy.
Basicly, when you're a Jew in an ocean of Christians, it's much more likely that you'll marry a Christian than a Jew, unless you have an inflexible criterion to only date Jews.
With an intermarriage rate around 50% for Reform and Conservative Jews, I expect Reform and Conservative Judaism to pretty-much disappear from the US within another 3 generations
Seriously, what's curious inall the comments is that no one mentioned how secular Israel is, as a country.....most of the Sabras are non-observant Jews...