It’s not the majority of the world, but there are a few dozen countries that primarily use FPTP. It’s used in North America, Europe, Africa, South Asia, the Middle East and a bunch of Pacific island nations. Belarus and the UK appear to be the only European nations to do so though, yes.

Here’s a map of the counties that primarily use FPTP: en.m.wikipedia.org/…/First-past-the-post_voting#/…

Also proportional voting is only used for groups of elected seats, not single winner elections.