I will admit to not memorizing everything I read, but I believe the Pauline letters mention saints a number of times. Please noet that they may not be translated as such because saints may come from the Latin Sanctus or Greek Hagios, and we now how weird translations can be, or even interpretations.
Canonization, or glorification, is actually just a recognition that the individual in question is a saint in heaven and was before the declaration, sort of like when you announce the discovery of some plant or another. It existed before you found it, and it’s still there. However, unlike plants, the saint says in heaven rather than going extinct.

In the Catholic Church, it could be formal or informal, but the formal process has a lot more scrutiny and lately canonization is something reserved to the Holy See. That said, there’s no right involved, you just look for miracles, p(name removed by moderator)oint which saint you think it came from, and then make your declaration. I might have it wrong, but I think it’s mostly right.
The Orthodox, Anglicans, and Lutherans have a calendar of saints similar to the Catholic’s set of declared saints. One of the reasons why Protestants left the Church is because of the saints, and the devotions associated with them. Well, besides that, if you throw out purgatory than they’re all supposed to go up, right? Why bother with canonization then? Uh, did it answer the questions?