Luke's claim was about "everyone at one of the major New Testament Studies conferences", not every self-avowed Christian. I don't doubt that most Christians believe Jesus had magical powers. I'm a lot less certain that even a majority of attendees "at one of the major New Testament Studies conferences" believes Jesus had magical powers. In fact, thinking back on all the New Testament Scholars I've known (more than a few, though not necessarily representative of the entire field) I can't come up with a single name of one I'm confident of saying, "yes, this person believes Jesus had magical powers." I'm sure they're out there, but I'm not sure they even make up a majority of New Testament scholars.
I can think of one such scholar who professed a belief in the resurrection but when he was asked to explain what exactly he meant by that, it became clear that he had "faith" that Jesus was there and resurrected even though no one could actually see him post-resurrection. That's pretty flimsy. Serious Bible scholarship (or, for that matter, Church history) is really, really faith-killing. Many scholars went into school committed Christians and came out the other end, well, not. I already mentioned Bart Ehrman. Karen Armstrong is another well-known example. I think they're both still theists, but neither is close to a conventional Christian. I'm not sure either would actually call themselves Christian any more.
Recall Bismarck's famous quote that "Laws, like sausages, cease to inspire respect in proportion as we know how they are made." I'd add religion to that list. The most effective way to deconvert a Christian may not be to teach them science. It may well be to teach them more about their own religion.
(My claim: There is no large Christian tradition which does not insist that the bodily resurrection did actually happen. I agree with your comment in general, although there are plenty of Schools of Divinity at respected universities whose staff still believes in the usual fairytale. Many atheists know their bible quite well, yet I wouldn't count that as Christians not believing in the bodily resurrection.)
So, one more litany, hopefully someone else finds it as useful.
It's an understatement that humility is not a common virtue in online discussions, even, or especially when it's most needed.
I'll start with my own recent example. I thought up a clear and obvious objection to one of the assertions in Eliezer's critique of the FAI effort compared with the Pascal's Wager and started writing a witty reply. ...And then I stopped. In large part because I had just gone through the same situation, but on the other side, dealing with some of the comments to my post about time-turners and General Relativity by those who know next to nothing about General Relativity. It was irritating, yet here I was, falling into the same trap. And not for the first time, far from it. The following is the resulting thought process, distilled to one paragraph.
I have not spent 10,000+ hours thinking about this topic in a professional, all-out, do-the-impossible way. I probably have not spent even one hour seriously thinking about it. I probably do not have the prerequisites required to do so. I probably don't even know what prerequisites are required to think about this topic productively. In short, there are almost guaranteed to exist unknown unknowns which are bound to trip up a novice like me. The odds that I find a clever argument contradicting someone who works on this topic for a living, just by reading one or two popular explanations of it are minuscule. So if I think up such an argument, the odds of it being both new and correct are heavily stacked against me. It is true that they are non-zero, and there are popular examples of non-experts finding flaws in an established theory where there is a consensus among the experts. Some of them might even be true stories. No, Einstein was not one of these non-experts, and even if he were, I am not Einstein.
And so on. So I came up with the following, rather unpolished mantra:
If I think up what seems like an obvious objection, I will resist assuming that I have found a Weaksauce Weakness in the experts' logic. Instead I may ask politely whether my argument is a valid one, and if not, where the flaw lies.
If you think it useful, feel free to improve the wording.