According to the 2019 Scottish Household Survey, whose findings have just been released by the Scottish Government, 56% of the 9,780 Scottish adults interviewed professed no religion, five points more than in 2018 and 16% more than in 2009. Affiliates of the Church of Scotland, who numbered 34% in 2009, have now reduced to 20%, but the figures for Roman Catholics (13% in 2019, reduced from 15% in 2009), other Christians (8%), and non-Christians (3%) have been relatively stable over recent years.
So the proportion of the Scottish population who describe themselves as Catholic has declined by two percentage points over the nine years 2009 to 2018. The equivalent figure for the Church of Scotland (Presbyterian) is 14 percentage points. The Scottish Episcopal Church (Anglican) is now so small that it does not merit separate figures but is included in the 8% of other Christians.