system
Given the following post, respond as if you're commenting on Reddit:
human
[DOOM - any and all continuities] If a way could be found to prevent possession, or if the forces of Hell were unable to possess people for whatever reason, would they stand a chance against Earth's forces?

Assume that a portal opens up and humanity has to close it (or invade and occupy Hell, I guess).  The forces of Hell want to invade and occupy Earth.

It seems like their big advantages are:

Teleportation (but they don't seem to abuse it as much as you'd think it would make sense to).

Possession- they don't even need to take over places the normal way when they can just possess everyone there and make them into demons/quasi zombies.

Corruption- in the more traditional sense.  They just find some useful idiots to go turncoat and screw the rest of humanity over for dubious benefits.

That last one might be their strongest asset, given the overwhelming technological advantage we have.

As it is, without a human grafting tech to their demons, Hell's forces are pretty much restricted to possessing humans who can use human weapons, or whatever they can innately do (spitting fireballs, scratching and biting).  OTOH we humans can slap some high tech weaponry into any schmuck's hands and with some minimal training (point and shoot, stay calm under fire) they can be as strong as anyone else, at least at range.

Or, as I put it in Call of Duty: "It turns out that stupid people's bullets hurt just as much."

I'm not saying the conflict wouldn't be bloody, but would Hell have a chance of winning without possession?  Maybe if they had infinite reinforcements they could eventually overwhelm humanity, but even without considering the heavier stuff we have at our disposal, our small arms seem more than a match for demonic forces that cannot simply possess the majority of us.
gpt
Demons are incredibly durable even the weakest specimens requires sustained small arms fire to kill. Larger demons require no less than anti armor weaponry to down, don't require food or sleep, and can cut through heavy armor.

Your overestimating the effectiveness of an average soldier, in combat it takes several thousand rounds fired to kill an enemy combatant. That's with human targets, imps rarely stay on the ground or attack in a large clump, hellknights will charge straight through any defensive structure you've built and sow unparalleled chaos, Pinkies will soak everything short of an anti armor explosive.

Our biggest advantage would be air superiority and even that won't last without infrastructure . Hell would either straight up win or severely cripple humanity us.