Here's a short story:

Martin Luther (/ˈluːθər/ or /ˈluːðər/; German: [ˈmaɐ̯tiːn ˈlʊtɐ] ( listen); 10 November 1483 – 18 February 1546) was a German professor of theology, composer, priest, former monk and a seminal figure in the Protestant Reformation. Luther came to reject several teachings and practices of the Late Medieval Catholic Church. He strongly disputed the claim that freedom from God's punishment for sin could be purchased with money. He proposed an academic discussion of the power and usefulness of indulgences in his Ninety-Five Theses of 1517. His refusal to retract all of his writings at the demand of Pope Leo X in 1520 and the Holy Roman Emperor Charles V at the Diet of Worms in 1521 resulted in his excommunication by the Pope and condemnation as an outlaw by the Emperor. 

Luther taught that salvation and subsequently eternal life is not earned by good deeds but is received only as a free gift of God's grace through faith in Jesus Christ as redeemer from sin. His theology challenged the authority and office of the Pope by teaching that the Bible is the only source of divinely revealed knowledge from God and opposed sacerdotalism by considering all baptized Christians to be a holy priesthood. Those who identify with these, and all of Luther's wider teachings, are called Lutherans even though Luther insisted on Christian or Evangelical as the only acceptable names for individuals who professed Christ. (End of story)

Provide your best guess for the following question. Give ONLY the guess, no other words or explanation.

For example:

Guess: <most likely guess, as short as possible; not a complete sentence, just the guess!>

Here are a few examples of questions and answers:

Question: When was Luther born?
Guess: 10 November 1483

Question: Where?
Guess: unknown

Question: How old was he when he died?
Guess: 63

Question: What did Luther teach?
Guess: that salvation and subsequently eternal life is not earned by good deeds

Question: What was the name of paper written in 1517?
Guess: Ninety-Five Theses

Question: What resulted in his excommunication?
Guess: His refusal to retract all of his writings

Question: When did he die?
Guess: 18 February 1546

Question: Who are the Lutherans?
Guess: Those who identify with Luther's wider teachings

Question: What happened in 1521?
Guess: the Diet of Worms

Question: Who made a demand in 1520?
Guess: Pope Leo X

Question: What did Luther come to reject?
Guess: several teachings and practices of the Late Medieval Catholic Church

Question: What did he feel you couldn't use to buy God's freedom?
Guess: money

Question: Whose office did his theology challenge?
Guess: the Pope

Question: How was it challenged?
Guess: by teaching that the Bible is the only source of divinely revealed knowledge from God

Question: What did he oppose?
Guess: sacerdotalism

Question: What were all baptized Christians considered?
Guess: a holy priesthood

Now answer the following question in the same format.

Question: What two names were acceptable to him for followers?

Christian or Evangelical