In a tweet dated back to, strangely enough, December of last year, the Church of Sweden tweeted that:
"Jesus of Nazareth has now appointed one of his successors, Greta Thunberg."
Based on their follow-up tweet in response to the controversy that ensued, in which they apologized for hurt feelings but also declared that "Our meaning has been to talk about Jesus Christ in our own way", it would appear that they weren't kidding.
This kid, who has championed a social cause unrelated to religion and who has made little in way of personal sacrifice pursuant to such, is evidently now regarded as a saint at least by the Church of Sweden and a new messiah superseding Jesus's ministry at most.
...Which is why European Christianity is a joke. "We're behind you and the good work you're doing" is one thing. This is just, ugh.