I am not posting this Cafe Society because my question is not about the movies. But this may not have a “real” answer, so move it if you see fit.
My question is if a Godzilla like creature was attacking us, would we (the US military of today) be able to kill/stop it? I think we would be able to kill it. Yes, it is massive, but it is flesh and blood. Even if its hide were to have bone plates and be very thick, I have to think we would be able to pierce it and cause massive damage to the creature.