“God” is really just an idea that humans came up with a long long time ago. Since then there have been many many different ideas of “God”. In other words, there have been many many different religions. They are all just various fictions. But these religions have been presented as if they were true. Religions usually have an idea of “God” as an all powerful supernatural entity, that should be worshiped and obeyed.
A newborn baby who was never exposed to any religious fiction at all, would not automatically develop a specific idea of “God”. However, as the child grew and experienced life, he might or might not come up with his own fiction about a possible supernatural being that created everything, and controls things in some way. This is because we humans tend to be naturally superstitious. If you examine life carefully and honestly, as you grow older, you should eventually recognize that there is no such thing as the supernatural. But many people never realize that and continue with their belief in their supernatural “God” idea and with their particular religious fiction.
So to answer your question about the word “God”, it only has power to the extent that some people believe the fiction is real and try to impose it on themselves and others.