Is that because Lapland is nothing but mountains and snow? Do any Sami live in Lapland?
Yes for both. Actually it could be possible that Lapland was considered backwoods just because of Samis. Majorities tend to discriminate minorities.
On a sidenote, how Orthodox is Finland? I'm curious.
Not much. Back in the days it was basically ethnic religion of Karelians and Russians. When one converted to Lutheranism from Orhodoxy that basically meant also a change of national identity i.e. a Russian became a Finn. An idea that one can be a Finn and an Orthodox was born when Finland was annexed to Russia in the beginning of 19th since the emperor's religion became a tolerated religion. Still, it remained basically as an ethic religion. When Finland became independent Orthodoxy got her status as another state religion probably because politicians wanted socialize Karelians as a part of mainstream Finnish society. Still, Finland remained and still is a mostly Lutheran country. The president participates in a some prayer service during the independence day and we have church tax etc. but that's just about it.
Orthodoxy's ethnic trait has started to fade only in recent decades. When Soviet Union conquered much of Eastern Finland the inhabitants were evaquated everywhere in Finland. Amusingly Orthodoxy has become even a little trendy probably because influx of converts and because people deem her a little exotic and different from the regular Finnishness but still more stable and safe. Still, only 1,1% of Finns are Orhodox Christians.