You have that backwards. That analogy is typically given to the faithful to make it more clear as to just how silly some of the beliefs appear to outsiders. Which on some level you get, you just don't understand the intent of the analogy.
If I were to say I was questioning the silly idea that we evolved from apes from about the third grade onward when I stopped believing in the tooth fairy and Santa Claus, all while ignoring what ToE says and the reasons people have for believing it to be true, then I would be making a statement that was no less ignorant. There are many ideas that may look silly from the outside, but our ignorance about them should be a reason to either learn more or keep silent rather than to assert their silliness.
Sorry, I misread your statement, I thought you were saying that the people who left their religion tended to know more about the religion they left. It's a shame, but I guess it doesn't surprise me that people who left one religion would be more inclined to learn about other religions that people who tend to consider other religions to be false by nature their religion being true. I personally only missed one of the answers on the quizz because I changed it at the last minute, but it is kind of hobby of mine. I have a friend I admire who regularly reads books by authors he disagrees with, but I haven't gotten there yet.
That good you speak of was a means of controlling the population and subjugating alternative points of view. And was ultimately used as a stick to try and fend off other people's rights. Doing the right thing for the wrong reason is something which genuinely moral people are supposed to avoid doing.
I'd be happy to see a source if you had one, but the good I was referring to was along these lines:
"During the first half of the twentieth century, the agency began primarily as an adoption/foster care agency, then continued to expand and evolve in order to provide direct assistance to poverty-stricken families, the elderly, single pregnant women, and newly-arrived immigrants. Between 1916 and 1920, branch offices opened in Brockton, Lawrence, Lynn, Salem, Somerville, and Lowell to assist needy Catholics and to reach out to include non-Catholic immigrants.
During the Great Depression, Catholic Charities joined with local social service agencies of all faiths to form the Community Federation of Boston, directly assisting hundreds of thousands of needy individuals. Catholic Charities supplied food and clothing to thousands of families daily and continued to find homes for orphans and children in need. As the Depression ended, Catholic Charities shifted its emphasis from direct assistance to adoption, foster care, marital counseling, alcohol abuse treatment, and immigration and refugee services."
Now, if they had kept their nose out of politics and hadn't been using their tax exempt organizations to engage in political activity, I might be a bit more willing to buy into the good they were doing.
Again, I agree that it's something they shouldn't be doing, but that does not negate all the things that they have done right.