Only about one very specific subject. Besides, it's not really a lack of critical thinking, their cognitive dissonance prevents them from even getting to the critical part. They fail to recognize this, there's their flaw.
Some, honestly, can't. However, many can. It really depends how critical their brain is in the first place.
I think critical thinking is partially a genetic trait, but I think it's majorly a learned trait. If someone is discouraged from thinking anything other than what they are told to think, they aren't critical thinkers. (This goes for everyone, not just Christians.) If you are encouraged to think, to ask questions, to find answers that make sense, then it's much easier to be a critical thinker.
I think it's easier for some Christians to take what they are taught about their religion at face value and trust that it's exactly as they are told it is. But some aren't like that.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.