Oh really? Well Exedus, if you use the 1% growth number from the article, extrapolate to 2080 and use 36 million as the current population you arrive at a population for Canada of 67 million, not 80 million.

In a response to another poster I have showed how to calculate projected Muslim population, using whatever percentages you want.

As for the race issue, I explicitly, EXPLICITLY, stated  that race was not the issue. Beliefs are. Beliefs such as separation of church and state, primacy of individual liberties, freedom of expression.

As for your assertion that "many of them will become athiests or agnostic by then" that is pure unsubstantiated speculation: Stats Can census questions give the opportunity to state "none" when asking about religion, so the growth rates from 1991 to 2011 are only for those people still identifying as Muslim.

It is just a matter of what percentages are to be believed. The resultant arithmetic is not open to question.