I think this represents a major failure of security (in this case the Army). The key point is not his religion, but the fact he converted to Islam and spent four years in Syria, a terrorist sponsoring state !!!. Are the officers and civilians in charge of Army clearances incompetent or reckless ? Does anyone care to speak up for the Army ?
Of course it does. However, as long as we have hundreds of Wahhabi-funded fifth-columnist islamofascist mosques operating in the US, they (and at least a few of the Americans they convert) will find ways to subvert us, no matter how tight our security is.
Moreover, the tragic downfall of "mainline" Christianity makes the islamists believe they can win over the "corrupt, decadent" US. Think, for example, what most muslims (and even more so islamofascists) think when the "mainline" denominations accept homosexuality, and when they don't lift a finger or even protest when Christians are persecuted in islamic countries.