They don't "get it" because they afraid to "get it".
It might be because they're afraid of admitting they've been so wrong for so long.
It might be because they're afraid of the reactions of the community they've been
a part of for so long.
It might be because they're afraid they won't be able to function without their delusions.
It might be a combination of all those things and more.
The bottom line is they are afraid, and it's just easier to stay immersed in "church world".
People tend to remain in their comfort zones, out of fear.

Indoctrination is a very popular theme on this site, but I think it’s an oversimplification of a much more complex relationship. It’s natural to assume that the way my brain operates is the way everybody’s brain operates, but capacities and styles of cognition vary widely biologically even within families.

What they’re doing is clearly meaningful to them or they wouldn’t continue doing it. One could say that assuming an evil intent on the part of some imagined oppressive hierarchy might be just as “superstitious” as assuming the existence of a benevolent god.

Maybe they are just being who they are. Maybe accepting our differences, in some cases, might be as close as we can get to making peace.

Maybe your family just isn't as smart as you are, sometimes dumb parents produce bright kids, in spite of themselves.

"A man hears what he wants to hear, and disregards the rest." Paul Simon
Religion (& insurance) plays on the fears of people & so they believe.

That's a good question. In light of the fact when the Babble was written, all life was assumed to be on Earth and Earth was the center of the universe, with the stars just holes in the canopy covering the "World". So what happens if we discover life elsewhere or better yet, meet an extra terrestial "intelligence" that worships "Bebo"??

Leave them be.

They "don't get it" because they don't want to get it. Unless someone is open to the possibility of being wrong, and has a desire to seek answers outside of their religious mindset, they will stay right where they are, thinking that they hold the correct beliefs, wearing their blinders and blocking out anything that might cause them to have doubts--because doubts, and using reason, is just Satan trying to cause them to fall.

It is the disambiguation that empowers those that lead and enslaves those that follow.

I agree with you. They don't get it because if they did they would have to admit they were wrong. After all, they are believers because they want to know where we came from, why we are here, and where we are going. Evangelical belief seems to have all of that. My religious friend from childhood often compares world events today to things in that crazy book of Revelation. It's nonsense and bullshit. I'm finding out now that groups of Evangelicals are comparing Trump to Cyrus of Persia. I think the world has gone mad.

indoctrination: This video does a rather good job of describing the process. Worth the watch - -

I think you should get a balaclava and some dark clothing and get out there one dark night and do some creative writing to that sign. That will give them something to think about.

"The World", in fact everything, is what that pastor and that congression say it is. That's why christians shop around for a church that suits their views. It's the commoditization of fantasy.

All the years of brain washing prevents them of seeing the correct way.

Oxymoron: referring to a believer that they see clearly.

There could be many reasons. One of the most prolific is "group think". When a grooup has a belief they tend to stay with it dispite the evidence as everyone beloeves that. There is also a fear of rejection that comes with group think. Stop believing and it is common to loose friends and family.

Brain washing, time consuming but effective.

You can lead a horse to water but you can't make them drink........

Blind to anything that's not what they believe

Ive been there. They love revival because they can do that stupid, "who in the crowd is willing to pledge 100$" thing... Also super cringe.

Family and their love of religion, despite its massive contradictions, is massive source of frustration for me too! Whenever I point out contradictions, rather than them engaging in why they believe what they believe, they does go quiet as if the contradictions are not relevant. The issue is that they want to believe, even though it's a story, probably not unlike Star Wars followers who follow the ritus despite knowing it's a story.

They will be ostracized in the community, lose friends, and maybe work, if they object.

They are connected to a cult. Only cults do revivals.

I could provide a long and scientific answer to your question. However, I'm a bit busy at the moment with other studies. I'd be happy to correspond more deeply later in the year on the matter.