I would not agree that choosing Islam over Christianity implies someone must be biased. The historical facts are: Aslan was born Muslim, converted to Christianity as a teen, then before going on to Harvard Divinity, converted back to Islam. Yes this is a fair subject to delve into, just as Aslan feels knowing Jesus the man is or should be relevant to Christians. By the same token, knowing Aslan the man, historically, is(?) should be(?) relevant to readers of his book. Some critics view his book as a thinly-veiled attempt to debunk many myths of Christianity. This is nothing new. This has been going on, including within Christianity itself, for decades. Some will tell you among scholars for hundreds of years. I haven’t read his book so I can’t tell you whether he does this better or worse than his predecessors but I’ve listened to other interviews with him and have not heard anything from him that others have not said before him.