Eastern Europe tended to be Protestant and Western Europe Catholic, the broad trend about the religious makeup of Europe by 1650 is accurate.
Catholics are the largest Christian group in the EU, accounting for 41% of the EU population, the Eastern Orthodox Church 10%, Protestants 9%, and other Christians 4% of the EU population. 17% of the EU population is non-believers/agnostics, 10% are atheists and 2% are Muslims.
Protestant Reform was a religious reform movement that swept Europe in the 15th century. It led to the creation of a Christian branch called Protestant, a name collectively used to refer to many religious groups that split from the Roman Catholic Church due to differences in doctrine.
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