Could the Imperium of Man (Warhammer 40k) fend off The Legions of Hell (Doom)

In this scenario, Hell decides a planet owned by The Imperium of Man is the next they will invade and consume. Hell wins if they fully consume the planet or if The Imperium of Man is forced to excute Exterminatus. The Imperium of Man wins if they can successfully fend off Hell, such as by killing all 3 Hell Priests and all the invading demons (The hell priests allow for more demons to teleport to the Planet)