Let me get back to: who's next?

Allowing same-sex marriage is part of the platform of Syriza in Greece. They currently have too many other problems to deal with for that to be an immediate priority, but the fact that Greeks voted them in says something.

Croatia is a mess. Know-nothing Catholic populists (ultimately the result of manipulation by Pope John Paul Ringo) got a ban on same-sex marriage through a referendum, against the opposition of all major political parties. Regardless, the government has legitimized same-sex civil partnerships. The fact that the current Pope isn't such a neo-mediaeval fascist shitbag may make a difference.

Most of Orthodox Eastern Europe has banned same-sex marriage constitutionally. The Orthodox church hasn't been as badly affected by child abuse scandals as the Roman one, but most likely that's just because their coverups are still working. Once they get found out things may change.