His reasoning (such as it is) is that more people responded to the consultation on Marriage Equality than did on Scottish Independence and there is going to be a referendum on that!
But he is comparing apples with oranges here. Scottish Independence is a political issue which affects everyone and has major constitutional, domestic and international implications. Putting this to a public vote in a referendum is a resonable approach regardless of which side of the issue you fall. Marriage Equality is about fundamental human rights which actually should be automatic and not subject to a popular vote. The fact that public opinion, and the opinion of the polititians is very much in favour of this North of the Border and the RC Church’s bigoted homophobia in wanting to deny people these rights is being rejected just goes to show that the poor old cardinal just doesn’t get it!