They would be a great source for Arabic translators. Our military and intel agencies have special cram programs where linguistically talented people can pick up a new tongue in 6 months. During the Cold War they turned out Russian speakers in 6 months. Even the assimilated children of Arab Christians will make great candidates for such a program and go through it in 3 months.They cannot replace the talent of native speakers in 6 months (or even 6 years). They can educate. Education, talent, experience, and other factors can produce results. The genuine Arab Christians are a vital asset. Another group are Jews who were raised in Arabic speaking countries. Neither of these groups have any reason to aid the terrorists. The problem to consider is how permeated the INTEL agencies are with arabists who already are moslem ... and how they would resist using the two aforementioned groups.
How many more Americans must die due to incompetence or dereliction of duty ?
You can turn out analysts in 6 months who can read websites and email, translate articles etc but to have someone who can walk right into terrorland and appear to be a native, you gotta have someone who was born and raised in terrorland.