Historically The Protestants view of Christianity doesn't kill people and is New Testament Based , whereas the Catholic view follows the old Testament and kills people.
There are also a lot more different denominations that claim the right of being the original.
Sadly there are so many denominations that It doesn't matter to me anymore.
Of course people say that the Catholics were the first of the Christian denominations, but through evidence and historical records found in places other than just Rome, I
believe Christianity use to be a good system until people warped it out of its original context.