2008 map of the two main Christian denominations in Germany:
  majority Roman Catholic (&gt;50%)
  more Roman Catholic than Protestant
  majority not part of a Christian denomination, but more Roman Catholic than Protestant
  mainly Protestant (&gt;50%)
  more Protestant than Roman Catholic
  majority non-religious, Protestant minority larger than the Roman Catholic minority
source: EKiR - Statistik zur Synode 2010  © Evangelische Kirche im Rheinland - Statistischer Dienst im Landeskirchenamt, http://www.ekir.de/ekir/dokumente/Tab01.pdf

An updated version (for the year 2020) of the map is available.
Own work, based on the table in w:de:Religionen in Deutschland
Bowzer