Hi Paul ,

 

Following to your below estimation about 4.5 B Christian in heaven is a huge number

 

 

http://www.fivedoves.com/letters/jan2012/paulw125-2.htm

 

 

maybe be we can start from Revelations 21: 16   about the new Jerusalem size

 

 

16 And the city lieth foursquare, and the length is as large as the breadth: and he measured the city with the reed, twelve thousand furlongs. The length and the breadth and the height of it are equal.

 

in another version its written 1500 miles

 

 

so 1500 x 1500 equals    2 250 000     miles  square

 

 

and as examples of population density lets say USA

 

http://en.wikipedia.org/wiki/List_of_U.S._states_by_population_density

 

 

i don't thinck population density in heaven will be other than very confortable

 

 

so 2 250 000 x  100 = 225,000 000  in case 100 inhabitants per square mile

     2 250 000 x  200 = 450,000 000  in case 200 inhabitants per square mile

     2 250 000 x  333 = 750  Million inhabitants    in case of 333 inhabitants per sq m           

 

 

examples of population density in the world

http://www.infoplease.com/ipa/A0934666.html

 

Paul Joseph