Many modern human beings do not believe in God or disagree with the idea of a higher power who has the ability to change the world. Once someone denies the existence of a higher power, s/he is left to rely on other human beings to implement change. Standing alone, an individual cannot produce wide-ranging, substantial change unless s/he is exceptional (e.g., founders of Google, etc.).
However, most of us are not exceptional. Therefore, most people who do not believe in a higher power rely on groups of people to create change. In practice, groups of people solicit their government to implement change via government programs. In short, modern human beings seem to have replaced God with man-made governments.
The idea of God required humans to be beneath a higher power and to accept certain limitations; in contrast, the idea of government as a change agent places human beings in a similar role as an omniscient or omnipotent God.