Personally, I don't believe Facebook encourages patterns that are outside of the users' personal preferences in any way. Based on the stored cookies on the person's storage, users who are intent online shopper will generate online store advertisings on their facebook page. A person who likes browsing for music tend to get more music-based advertising on his/her page.
Thus it really depends on what kind of browsing history - and cookie generating contents - the user is prone to have. In all fairness, if a user dislikes or feels that an advertising is violating a personal preference or beliefs, s/he can report the offending advertising through a click of a button with a number of reasons - from 'not interested' to 'offensive' - and thus the advertising will store the cookie accordingly and prevent the 'disliked' advertisement to appear again on the user's dashboard. Furthermore, the ratio of religious app compared to the demographic of the users would really depend on the developer.
If there are more "Christian-" based developers, by proxy, there would be more Christian-based app compared to - say, Buddhist-based app. I'm sure if one is to search, there's bound to be just about an app for every religion - given that each religion has a developer who makes them. Hope that helps!
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.