So what you mean to say is that your untrained peasants would be given weapons and then sent to the frontlines? You'd have more people at the start of the war, true, but with that tactic you'd soon have a lot less.
The only numbers that matter:
Sweden:
Active personnel 30,000[2]
Reserve personnel 22,988 reserves and 38,000 militias[2][3]
Finland:
Active personnel 34,700 (ranked 79th)
Reserve personnel 357,000
Not to mention this, talking about Swedish Armed Forces: "Full mobilization is assumed to take one year (although no mobilization readiness exists), and the formations assumed are of battalion level size. It is assumed the Home Guard would be available within 1272 hours."
Oh yeah, and Swede's helped in the Winter War with 8700 men while Finns had 350,000 men fighting. That sure is a lot of help.