The population of Sub-Saharan Africa is larger than the population of North Africa. The fertility rate of North Africa (high as it is) is less than the fertility rate of Sub-Saharan Africa.
The two most populous nations in North Africa are Egypt (80 million) and Algeria (33 million).
In Sub-Saharan Africa, Nigeria has a population of (140 million) - greater than Egypt + Algeria, South Africa (47 million), Congo-Kinsasha (58 million), Ethiopia (70 million), Kenya (37 million).
Out of these nations, only Nigeria and Ethiopia have significant Muslim populations. The rest are predominantly Christian.
I did not pull these figures from my head. They are freely available. I don’t understand where the fiction that Islam is the fastest growing (or largest) religious grouping in Africa comes from.
Probably because internet sources tout it quite a bit. Here are some tables from wikipedia (I know, don't even say it, just using it as an example) that demonstrates Christianity as a whole is a minority religion -
Region | Total Population | Christians | % Christian | % of total Christians |
---|---|---|---|---|
Central Africa | 83,121,055 | 53,127,098 | 63.9% | 3.008% |
East Africa | 195,041,900 | 116,911,194 | 59.94% | 6.620% |
North Africa | 203,536,578 | 10,271,958 | 5.04% | 0.581% |
Southern Africa | 138,028,304 | 81,609,757 | 59.12% | 4.621% |
West Africa | 269,922,224 | 93,283,710 | 34.56% | 5.282% |
Total | 889,650,061 | 355,203,717 | 39.92% | 20.11% |
Region | Total Population | Muslims | % Muslim | % of Muslim total |
---|---|---|---|---|
Central Africa | 83,121,055 | 12.6 million | 15.1% | 3.1% |
East Africa | 193,741,900 | 66.4 million | 34.3% | 16.5% |
North Africa | 202,151,323 | 180 million | 89.1% | 44.8% |
Southern Africa | 137,092,019 | 8.9 million | 6.5% | 2.2% |
West Africa | 268,997,245 | 134.0 million | 49.8% | 33.3% |
Total | 885,103,542 | 402.0 million | 44.86% |