They're setting themselves up for the fall. When lightning was not understood, it was the work of the Greek and Roman gods. Nowdays we understand how to generate electricity and so as impressive as a bolt of lightning is, there's no great mystery about it.
Similarly, as our abilities to genetically engineer things increases we will eventually be able to produce things more perfectly than anything found in nature.
This religionist view of God as genetic engineer will become silly because human engineers will do a better job. Yet it is not because they consider themselves to be god like in their powers -- but because the creationists of today are so limited in their imaginations of what power a god like being must have. Just as the ancients thought only gods could produce electricity.
Indeed. When lightning rods were first proposed many clergymen condemned them, as they appeared to run counter to the manifest Will of God.
Yet after a time doubt crept in. Surely it was a weak God indeed, whose manifest Will could be deflected by $10 worth of metal from hitting the cathouse, while the church next door still received the brunt of His wrath. Perhaps God was not personally directing every lightning strike after all...