Alright, explain the components of growth that result in Canada having 50% Muslims in 2080, considering present immigration, birth rates, and rates of Muslims secularizing. 

Again, it sounds like they're extrapolating the "Tripling in 20 years" claim made in 2011, over the next 70. It's not "tripling", it's expanding linearly from 2-6%, 2% a decade. By 2080 it'll be up to 15% or so, assuming they don;'t all become secularized as second generation immigrants tend to.