Muslims have 2.6 rate in comparison to 2.2 which is an 18% difference but growth rate of Islamic population for the past two decades is 46% so you should do the math. Also while all the other theologies decline is because either they are migrating to the moon or they are converting to this religion of Islam slowly. Simple deduction.
Your deduction is "simple" indeed. A little to "simple". Seems like you don't really get what the difference in growth actually means and how it forms an exponential curve.
See, a higher fertility rate also results in
more breeding pairs who operate on that same higher fertility rate. Another thing that influences this curve, is what the average age of the breeding pairs is. When you have breeding pairs that reproduce typically at age 22, while in another group breeding pairs typically make a new generation at age 33, then that too will heavily influence population sizes, as the generation time for the first is much less then the latter. Meaning that the off spring of the first will reach its own breeding age much sooner.
It literally means that by the time the latter produces 2 generations, the first has produced 3.
Let's illustrate with a simple example using round numbers, for the sake of example.
Let's say we have 2 christian couples with an average of 2 kids per household.
Let's say we have 2 muslim couples with an average of 3 kids per household.
For the sake of example we assume an exact 50/50 distribution of male and female.
In generation one:
- 4 christian kids = 2 breeding pairs
- 6 muslim kids =
3 breeding pairs
Generation two:
- 4 christian kids = 2 breeding paris
-
9 muslim kids = 4 breeding pairs and one that doesn't find a mate
Generation 3:
- 4 christian kids = 2 breeding pairs
-
12 muslim kids = 6 breeding pairs
And if we would factor in the differences in age by saying that the christian couple breeds every 30 years while the muslims breed every 20 years, then by the time of christian generation 3, there will be 18 muslim kids instead of 12.
Just to illustrate to you that reproduction factors that are higher then 1, experience an exponential growth, and not a steady growth of simple sommation that always starts with the same base number.
We see this in the covid pandemic as well. I'm sure you heared of this "reproduction factor" and how important it is that it does not go above 1. Because if it does, the amount of infections rises
exponentially. And if this number rises 0.3%, it can actually already be enough to make all alarm bells go off and impose restrictions on society to slow it down again, before it goes completely out of control
very fast (due to exponential growth).
Also, I have NO CLUE where you pulled that 46% figure from???
I'll go ahead and assume that you were simply mistaken.
As you can see in the wiki article I linked you to, the growth of muslims in the world from 1990 to 2010 was some 2%...............