A theological question for the ages, however, I tend to opine that a god, lacking cattle to slaughter and children to kill, is more akin to a rock than a man, and so any hatred directed at it would be innately impotent.
Of course, you could set about killing his followers and burning his temples, but history has shown us that only weak peoples do this, and they are ultimately always defeated and converted. Cultureless and sterile, their descendants are quickly assimilated into the far superior stock of the people they 'conquer,' and soon they are nothing but a memory, mockingly aped by their descendants.
If one hates a god, then the proper course of action is to get one of your own, who is stronger, and convert everyone around you on the edge of a sword. That way, in a thousand years, the grandchildren of your enemies will weep to think that they were ever descended from heathen scum, and will willingly defile the tombs of their forefathers, and spit upon their names.