Scotland on the way to legalizing gay marriage in civil & religious ceremonies

Opposition has come from religious institutions:

The Roman Catholic church, backed by senior Muslim organisations and evangelical and presbyterian churches, organised a huge postcard and internet petition campaign against the proposals.

It has been overwhelmed by popular support:

...detailed responses using the Scottish government's own online consultation document showed a majority in favour of gay marriage: by 65% to 35% against. Major public opinion polls also showed that most Scottish voters supported same-sex marriage, with about two-thirds of Scots in favour.

So it is expected to pass, and not as an isolated phonomenon:

he measures are expected to be passed by Holyrood next year before similar but weaker measures in England and Wales, to allow same-sex marriages in registry offices, are put before Westminster.

Church-led opposition continues but BBC reports:

Scotland could become the first part of the UK to introduce gay marriage after the SNP government announced plans to make the change.

Ministers confirmed they would bring forward a bill on the issue, indicating the earliest ceremonies could take place by the start of 2015.