Nope...
First time he fights both heaven and hell!
Because of his existence the war is more an unequal balance so both sides wish to kill him before his place had been sided.
But during most of the first arc, he meets friends and comrades (they soon also become the first line of to human supers
)
And during the chaos he fights both sides and holds the battle to a stand still.
During this halt Devilman finds out the corruption in heaven and ventures there to destroy it (as God would never have a Huge war on earth that could risk lives)
Devilman Then ends the major war.
Earth and humanity now know of Devils, Angels, Heaven, Hell and a hero Devilman.
God turn Devilman Blue to show his good spirit (he is red at the beginning)