It sounds like there is a lot of evidence that Major Hasan had Islamicist-extremist tendencies. But these words are not good evidence.
There is a reason the Pledge of Allegiance asks us to pledge to our country ”under God.” The best American tradition has never required people to surrender their first allegiance as a condition of citizenship.
My sympathies to Muslim fellow-citizens on the coverage of that particular quote.
I remain, “the King’s good servant, but God’s first.”