Many people mistakenly blame religious accommodation for the decline of the Christian presence in Canada, but what is the biggest factor?

A) religious discrimination
B) media attention to fundamentalism
C) decline in church attendance
D) aging population

The decline in church attendance is cited as the biggest factor in the decline of the Christian presence in Canada. This is supported by statistics that show a steady decline in church attendance across the country over the past few decades. While religious discrimination and media attention to fundamentalism may affect public perception of Christianity, they are not as significant in terms of actual impact on the size of Christian communities. The aging population may also affect the number of religious adherents, but it is not the primary factor.