Religion improvements

Religion was a very recognized new concept in Civ 4. It was innovative and useful for gameplay improvement. I liked its neutrality and effects on diplomacy and production, however, religion can be expanded in some ways.

• Include religion percentage by cities. This is more realistic and can add new concepts to the game like minorities. It can be linked with an ethnic percetage by cities.
  
• Include tribal religions (100% in a city before founding a religion) and atheism. 
  
• The settlers should spread religions to the new founded cities.
  
• Give a higher bonus from an homogenous religion within a city and official state religion.
  
• Include religious events based on religion diversity: unhappiness, terrorism, spread foreign cultures.
  
• To prevent consequences from bad religion events add new concepts like sacrifice, evangelism, inquisition or cruzades. These new concepts should encourage state and local religion.
  
• Sacrifice would be the posibility to take war prisioners and kill them for religious spread (war prisioners is a new proposed concept in military improvements).
  
• Cruzades and inquisition should be implemented in Civ 5, they will spread and preserve religion, maybe they could be implemented as civics.
  
• Preserve the missionary unit.

All these posible implementations should come with changes in religion bonus, diplomacy and economy.