People have believed in a God, not necessarily the same God, for millions of years man has been on the planet and they will believe until every last human is destroyed.
I don't think that is a reasonable assertion to make.
Religion is borne of ignorance and a need to imagine the answers to the questions of life, the universe and everything. Since the human species has begun to explore its reality by way of the scientific method of observation, measurement and testing, we have rapidly learned to better understand the cause-and-effect action/reaction processes that make up our universe and are growing increasingly aware of the fact that 'god did it' isn't knowledge of any kind.
That atheism is spreading rapidly in educated cultures tells you that, in time, it will be become harder and harder for adults to deny their children the right to learn critical thinking skills and question what they are told.
In the meantime we are witnessing the writhing and twitching dying of global religions as they lose hold of those able to think for themselves, leaving only the fundamentalist-level militant theists who will continue to disgust the 'moderates' to the degree that they, too, cannot bring themselves to remain part of such a toxic and dysfunctional group-think.
The more the fundamentalists commit atrocities across the world, the quicker they are bringing about the end of their own religions.
In time functional reasoning will see theism committed to the annals of history and held up as examples of toxic dysfunction which contributed to neurological and psychological disorders driving people to commit criminal and harmful acts against each other.