Where in Hell or Earth did you get that idea.Three Days Grace is just a Christian band.
It's already been said that they are not at all an emo band. If you listen to the basis of just about any rock music lately, it deals with hate and sorrow. Pretty sucky, the theme of it, but it's still good music. Shinedown, one of my favorite bands, has pretty crybaby lyrics sometimes, but are far from emo.
Three Days Grace is in fact a Canadian alternative metal group.
And as far as looks go-- for some reason, a shitload of bands have this new look about them corresponding to "emo." Some are, some aren't. Really though, emo is a more ISLITMYWRISTSHOWABOUTYOU?! kind of thing. Most people are just scenists and want to look emo.
But yeah, they're Canadian Alternative Metal. So funny to think about it.