Three words: "Wounded Gazelle Gambit"
I mean, the entire point of the story is that the guy
died; this wasn't about somehow feigning injury.
It wouldn´t surprise me if He *let* himself be "wounded" for the sheer Wow-effect of a mere Mortal "having wounded God" and possibly having converted to Christianity afterwards
I mean. A big part of the
point, within the internal logic of the Christian belief system that describes all these events and without which there is no "Lance of Longinus" to even
talk about is that Christ isn't obviously an embodiment of God just from casual inspection. So what 'wow' factor? Doesn't make any sense. It's only a mystically significant event if you already accept the religion's narrative, unlike other miracles appearing in the Gospels.
Remember, in ACTUAL Christian lore Satan isn´t the Big Bad and Ruler of Hell - in the end he is a *prisoner* there like anyone else and there is no equivalent/counterpart to Him ("You shalt have no other Gods before Me", remember?). God is the Alpha and Omega after all and He is in control of every facet of Existence - the Good, the Bad and the Ugly.
...Before I continue ranting and say things that will upset more religous people, let´s just say, that I have a very negative on Religion in general and Him in particular for (in my opinion) taking advantage of an *Omniscient Morality License* He seems to posess in scripture.
OK, but if you're talking about Christian legends and why something is magically significant due to significance of Christianity, you need to pause and remember that you are talking about the internal logic of that religion's beliefs. You can have whatever complaints you like about Christianity and I'm not arguing with any of that right now, but you have to at least
understand the underlying ruleset.
It's sort of like how if you're going to discuss the Harry Potter novels, you have to accept that within the internal logic of the story,
magic exists. It's not all just a figment of their imagination.
The Lance of Longinus cannot be understood to have mystical significance except within the context of the Christian belief framework surrounding the Crucifixion. The context of that framework makes some interpretations credible, and others nonsensical, and that's that.