Obviously this was written for Catholics who don't read anything non Catholic...
Looking around the world, it's readily apparent that God used Martin Luther to the fullest, all across the earth...
And by reading the last of your sentence, God clearly chose someone who actually believed what He said...God is not leading His church into righteousness...He is not leading your Church into righteousness...Your religion is trying to lead it's members into it's own perception of righteousness...
We as Christians are righteous already...Have been since the day we accepted Jesus Christ as our Savior...
God revealed this truth to Martin Luther when Martin succumbed to God's written words and made them available to the masses...
As an ex-lutheran and now reverted back to Catholic Church, I can tell you I have always had a problem with this. How do you know Satan wasn't using MArtin Luther as a tool to split the church? Where does it say in scripture that when you accept Christ as your saviour that you are automatically going to heaven? Every protestant and Bible Chritian can never give me a straight answer on this. Also - Gods written word was already available to the masses. There already was a Bible in the vernacular. It seemed Martin Luther arrogantly needed to gut those portions of the Bible he a problem with instead of trying to get some insight from church leaders on them.