In a situation requiring a large number of deityhoods, since Zhou Tian couldn't aimlessly target other True Gods, his only logical choice was to kill enemies on the Battlefield at the time.
Given that Zhou Tian and the God King at that time were enemies, even if Zhou Tian killed many of the God King's subordinates on the Battlefield, no one would have much to say. After all, the Battlefield is a place of life and death struggles. Zhou Tian's ability to kill so many True Gods without harm was his skill. In that environment, the more True Gods Zhou Tian killed, the greater his intimidation would become. Generally, except for the Deities in the God King's Camp he attacked, other Deities would likely avoid offending Zhou Tian if they could.
And it was only in such an environment that Zhou Tian could swiftly obtain the deityhoods he wanted.
