Deification of humans is not uncommon in the world's cultures/religions. Something "becomes" a god the moment a human decides to deify that thing - it designates something worthy of worship, usually because it is greater-than but the reasoning can be legion. The most common form of deification of humans is ancestor worship, where one pays respects to one's progenitors and honors them for without progenitors oneself would simply not exist in this-time and this-place (as such, they are greater-than).