I'm neither Christian nor Jewish, but it's easy to wonder whether Spielberg is questioning the story of the resurrection and its ability to empower a system of belief. But he certainly hopes that absolute proof of a higher power would unite us. But then, he stopped short of that, it seems.
I recognize what Spielberg was trying to do with Disclosure Day. But his last hope of generating real-world rumination on those topics relied on his comparison to ancient religious belief, and that his film actually presents proof of extraterrestrial visitation.