That is a tremendously broad question. The beliefs and teachings of the Church are found in the Catechism. http://www.usccb.org/beliefs-and-teachin...
It came around 300 years after Jesus and two hundred after the last disciples died. They got most of their new converts by putting swords to their necks and have not stopped bullying people since. Then coming up with every get richer quick scheme and invented a bunch too.
Like selling indulgences. (Selling forgiveness of sins--PRENEED) If you had the money, they sold you a worthless price of paper. Saying you are forgiven.
Praying a person out of the waiting room when a person dies, to pray them into heaven. All for a cash fee. Funny, they seem to make it just as the family has no more money to give.
Bingo and much, much more. Is it any wonder few enjoy seeing a backwards collar coming at them? Of course, none of these things has not the slightest thing to do with True Bible teachings.
For most if them, the Bible teaches The opposite of Catholic doctrines. As only a part of Babylon the Great, they have leapt into bed with every politician on Earth. Scooping up every bit of money and power they could.
Such as in WWII, the Catolics made a deal with Germany, to give up Jews and Jewish locations in exchange for not bothering Catholic possessions. Then they preserve ignorance about doctrines. Papal letters are orders given by Rome.
One was issued to forbid the laity from reading the Bible. Another called for erasing God's personal name in all languages. From every hymnal, book, altar, painting and building.
There are thousands of buildings all over Europe with God's name in the Tetragrammatan in Hebrew, Greek and the languages of Europe.
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.