The story of David is meant to illustrate that we actually share the same values, but for some reason have chosen to demonize people we would otherwise lionize in retrospect.
That right there is your bad assumption: That self-declared Christians have anything remotely resembling "shared values".
Take two random self-described Christians and have them write down, "what would define a 'true Christian'" and you'll get two completely different sets of answers.
All religious beliefs are personal. Every member of every religion will pick & choose which tenets, sacred verses, etc that they want to believe and only believe in those things. No one agrees 100% on every little detail and only "extremists" follow their religions to the letter.
I believe the OP was referring to specific Christians who they converse with when the visit their family in the Midwest.
I think OP is right that there is a real phenomenon of people accepting a surveillance state without interrogating the notion. John Oliver's "dick pic" interview is an example of this. When he asked people on the streets if they were uncomfortable with bulk collection, due to (what I believe is) ignorance and physiological entrenchment, people parroted a response about national security. When forced to really confront the issues as they relate to their own lives, they changed their minds on the spot.
It isn't that their values shifted. They had a version of the narrative in their heads which was convincing, but shallow; it persists only because it is largely undisturbed. Good on OP for shaking things up.
There are other people who will genuinely disagree, and I imagine tell OP something like (disclaimer: I haven't read the story and am guessing), "David was facing a tyrannical monarch, we live in a free democracy; Snowden would receive a fair trial, so he should return to the States."
> All religious beliefs are personal. Every member of every religion will pick & choose which tenets, sacred verses, etc that they want to believe and only believe in those things. No one agrees 100% on every little detail and only "extremists" follow their religions to the letter.
You're using a lot of absolutes in your statement. It's as if you have some secret knowledge about the way all religious people think. Care to expand on your reasoning?