Raising questions about an expert’s qualifications, motivations, and possible conflicts of interest is good practice. However, a fundamental principle of argument says that time is short and that one must therefore dispense with the bullshit.
This principle was violated by Fox News’ religion correspondent, Lauren Green, when she spent several minutes of an interview with well-known religious scholar Reza Aslan puzzling over why a Muslim would write a book about Jesus:
“You’re a Muslim, so why did you write a book about the founder of Christianity?”
This not on its face a stupid question, but that was pretty much the only question the interviewer had for the next several minutes. Her implication was that there is something suspect or inappropriate in a non-Christian’s writing about Jesus. This is a variation on the fallacious variety of the ad hominem circumstantial: you’re just saying what you say about Jesus because you’re a Muslim out to terrorize Christianity with scholarship and footnotes.
That’s obviously silly and does not deserve refutation.
Sadly, having watched the interview, I have no idea what the book is about or whether it is any good.