Figure 5. Statistical development of the percentages of Christian and Muslim populations with respect to the total population of Europe as a whole from 1900 to 2010 (WCD)
From Figure 5 we see that in Europe as a whole the percentages of both Christians and Muslims changed during the previous century, with that of Christianity declining by 16% and that of Islam increasing by 4% from 1900 to 2010 (Table 2). The decline of Christianity as a whole reflects declines in both Roman Catholic and Protestant denominations. The significant increase in Muslim presence in Europe began around the 1960 time frame.
In Table 6, the data for the European continent are further broken down into regions.
Table 6. Differences in percentages of Christians and Muslims in the regions of Europe from 1900 to 2010 (WCD)
It is in Western Europe, the home of the Protestant Reformation and the seat of Roman Catholicism, that the startling decline in Christianity of -30% is observed, along with the largest growth in Muslim presence.