1) I'm not Muslim either. Again, you're placing far more importance on one's personal religious background than logic would suggest is desirable.
2) Aslan has several degrees. The ones most relevant to his involvement with religious academia would be the Masters in Theological Studies and his Doctorate in Sociology, which he acquired by writing a thesis on Jihadism. He's also written several books about religions with different emphasis. This of course is in addition to his many, many op-eds and interviews in a variety of publications and media on religious issues.
3) Aslan is also an associate professor in the Creative Writing Program at Riverside, in addition to his position as a research associate at USC, and his status as a published scholar on religious issues.
4) The reference to Chomsky made perfect sense. If you know who he is, it's in no way surprising that he'd write about linguistics. Similarly, if you know who Aslan is, it's in no way surprising he'd write about Jesus.
5) I'm not sure why you're bringing up smugness. If you're suggesting that Aslan was smug, I guess you were taught wrong, because in this case, his "smugness" has lead to massively increased sales and publicity for his book.
6) The bottom line is that this reporter made an absolute ass of herself, and most people seem pretty comfortable recognizing that fairly obvious fact. Did you even watch the whole interview? It's not like she asked him once why a Muslim would write about Jesus (which is stupid enough) she asked him four or five times from various angles, then accused him of trying to hide the fact that he's Muslim (despite the fact that it comes up in basically every public appearance he's ever made). It was an attack piece plain and simple, and it blew up in her face in the most hilarious possible way. Why on earth you're attempting to defend such a thing is beyond me.