Now, the illustration breaks down the pre-WW2 map of Germany into electorates. The redder the electorate the more support the Nazi's had in it. Green areas are areas where Nazi's were unable to win seats. Now the taller the individual electorate, the higher the proportion of Catholics in it. Flatter areas are Protestant dominant.
Now, it's pretty obvious that Catholic areas tended to vote strongly against Hitler, whilst the Protestants tended to vote for him. Note, this does not mean all Protestants voted for him,[paging Wilhelm Ropke] just the majority of them. Likewise, the majority of Catholics voted against Hitler; not all of them.