The Pope condemned the teachings of Martin Luther because they were contrary to the doctrine of the Catholic Church at the time, and threatened the monopoly that the Catholic had over religious authority in Western and Central Europe.
The Pope at the time was Leo X, and he was so displeased with Martin Luther, that he excommunicated him.
"It caused the Chinese to trade <span>for iron to be used in the compass" is not true since the trading in iron that was used for the compass was one primarily in the West. </span>