When will Muslim population surpass christian population?

Answer 1

I have seen an estimate which predicts 2020.

Answer:

The whole Muslim population conspiracy theory relates to bad science and poor data being used to support fear mongering. Typical is a YouTube video that claimed that Europe will be Muslim (Islamified) in just a few decades.

Most of the countries do not even collect the data through censuses that the claims are said to be based on. It is not even good science. As an example a lot of the claims such as Moslem women having an average of 8.1 children (opposing this the average "Christian" birthrate of 1.8) are unsupported, or that the Dutch Muslim community has half of the newborns even though they represent 5% of the population (14 times more fecund than the non-Moslem rate). The video claims inflated representation of Moslems in many countries, claims to report on government predictions of population shifts that have never been made.

As a consequence the conclusion that there will be a wholesale shift of populations from one group to another is unsupported, and the question "When will Muslim population surpass Christian population?" must be answered with "Not in any conceivable future"