What was the worlds population in 100 AD?

Question

What was the Christian population in 100 AD

Answer 1

Looking at the two links given by the previous three responders, it appears there were somewhere around 200 million people.

Answer 2

Since there was not a World census nor much in the way of a written record, there is no answer to your question in terms of a specific number. It is unlikely that any historian would even venture a "guess" as to how many people were alive on the Earth in 100 AD.
In regard to the "Christian population" in 100 AD; once again my prior answers are applicable. Also, Christianity was widespread in its' early days. As an example, the first truly Christian people were the Armenians in approximately 320 AD.
Even today the actual population of the World is a "guess." An educated guess, but, none the less a guess.

Answer 3

there is no way to know for sure, but at that time the population of Rome would have comprised roughly 21% of world population ~ roughly 70 million, give or take, putting total population somewhere around 3 to 400 million. The city and outlying provinces tallied roughly 948,000 registered lanholder/voters (male) by the middle of 200 AD, campaign census (population tally taken by roman clerks attached to leigons) could be counted on to be highly erronious and were therefore considered with abroad margins. Bottom line: we will never know for sure.

Answer 4

Most have reached a consensus that historical and future world populations look somehting like this (found at the link below). The scary part is the growth after 1950 is exponential:

Year Population
1 200 million
1000 275 million
1500 450 million
1650 500 million
1750 700 million
1804 1 billion
1850 1.2 billion
1900 1.6 billion
1927 2 billion
1950 2.55 billion
1955 2.8 billion
1960 3 billion
1965 3.3 billion
1970 3.7 billion
1975 4 billion
1980 4.5 billion
1985 4.85 billion
1990 5.3 billion
1995 5.7 billion
1999 6 billion
2000 6.1 billion
2005 6.45 billion
2006 6.5 billion
2010 6.8 billion
2020 7.6 billion
2030 8.2 billion
2040 8.8 billion
2050 9.2 billion

Answer 5

At the time of the Edict of Milan, issued by Emperor Constantine in 313 A.D, Approximately 10% of the population of the Empire were Christians.

To put that in perspective, approximately 10% of America at the present are atheists.

Christianity really didn't explode until the reign of Emperor Theodosius I, who made Christianity the state religion and ordered all pagan temples and pagan literature to be destroyed. This includes the burning of Plato's academy and possibly, the burning of the great Library of Alexandria. The Nicene creed was also codified during Theodosius's reign, which served to unite the Christians philosophically. by the turn of the 5th century, Theodosius was so effective that with the exceptions of small pockets, paganism was virtually extinct.

I'll leave it to the googlers who gave you the rote number of people in the world to determine percentages of population

Answer 6

Somewhere between 200,000,000 and 310,000,000.

Likely just over 200,000,000.

See:
http://en.wikipedia.org/wiki/World_population#Historical_figures
for historical data (in thousands).

As for the percentages of Christians at that time, it would be a very, very, very small number until around 300 when it was made the state religion of Armenia (in 301 AD) and legalized in Rome by Constantine (in 313 AD).

Answer 7

170 million, year 0
190 million, year 200

Answer 8

between 200,000,000 and 250,000,000