What I think you asking is what is the difference between the numerous Protestant Christian churches. You know that Christianity( in the relatively "modern" day ) until 1517 was only Catholic. The Christian church spilt after 1517 into the Protestant branch and the Catholic branch.
The is only one Catholic Church, all following the same Theology and catechism. The Protestant branch is made up of many different Protestant Christian churches (not Catholic) who all share the same fundamental belief that makes them Protestant not Catholic. In 1517 the Protestant branch was fairly unknown, ministers throughout Europe spread the word.
For Example Ministers like Jean Calvin and Martin Luther's congregations were known as Calvinists and Lutherans. So even though the name of the churches may differ, because different men during times of differenting societal situations interpreted &explained the new word slightly differently- it's all Christian. Try the story of Christianity vol 1&2 J Gonzalez.
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.