Is “Judeo-Christian” a coherent term?

This term has been used widely in America since the 1940s, and is often used today by both conservative Christians and conservative Jews to represent the shared moral and cultural project of Jews and Christians in America and elsewhere. Dennis Prager, most notably, wrote a series of columns (around 20 of them in all) talking about the concept. But there are some fairly substantial differences, even incompatibilities, between Jews and Christians regarding God, Jesus, Salvation, and even ordinary morality. So is this term really a useful or coherent one?

Resources:
Judeo-Christian (Wikipedia)