I don't think that it is wrong to think that Naruto could beat Hashirama, as opinions and thoughts are free. The question is whether that opinion of yours is wrong, and currently I think that Naruto has not caught up to Hashirama yet.
Considering the matchup, I believe that Hashirama is above Naruto in all categories (tai/gen/ninjutsu, weapons, natural chakra manipulation, battle experience, etc,) barring speed and amount of chakra perhaps. And I assume that both combatants will come to the battlefield with all of their abilities at the ready (not a fan of comparing "base" character against "powered-up" character.)