He would probably kill almost the entire earth because he's pissed off at one particular species, then think "Aw, shouldn't have done that" and gives one man the impossible task of collecting two of every species and put them on a boat. He would probably let beings come into existence without asking them if they want to, set up a set of rules by which those beings have to live but then communicate those rules in the worst possible way so that not two beings are exactly in agreement over what the rules are. Then he would punish everyone who doesn't follow those indecipherable rules by casting them into a lake of fire (although, again, there's much disagreement over how he punishes beings) while not accepting any form of responsibility. Worse, like an alcoholic blames everyone but himself for his problems, this god plays the sad victim and says that he just loves everyone, invites everyone to come to him and doesn't accept that his invitations possibly never reach most of his beings. He knows of all the sadness in the world - in fact, he's the creator of it all - but doesn't do a damn thing about it. Eventhough a mere blink of his eyes could erase any form of unhappiness. Again, any kind of sadness he would not consider his fault, but the fault of the beings he created. A child that gets cancer? Not god's fault. The child's then? Well, again, not everyone agrees. Possibly, one man a long, long time ago nibbled on the fruit of his wife, and because god had forbid that, children today must suffer cancer, aids, rape, poverty and misery. But it's not god's fault.
Meanwhile, this god, having created these beings and then left them in a complete state of bewilderment, expects these beings to worship him. Not just love him. Worship him. He expects them to get on their knees, have all kinds of strange rituals (no agreement as to what those rituals are), praise him, thank him. Worship him.
And you're not supposed to question anything about him.