Some people are objecting to the notion that we have a “Judeo-Christian” civilization, arguing instead that what we have is an “Islamo-Christian” civilization. See Does It Make Sense to Speak of Judeo-Christian Civilization? » First Thoughts | A First Things Blog.
The reason we can speak of the former–even though the Jews were persecuted and marginalized– is that the formative text for Western civilization has been the BIBLE. The Hebrew scriptures communicate a world view that, despite a whole array of religious differences, has become authoritative for Jews, Christians, and even (though they won’t admit it) secularists.
There is nothing like that commonality between Christians and Muslims.