Does he deserve to be worshipped and obeyed?
If so why?
If so, why does his abhorrent actions not morally make you question allegiance to him?
Does his authority alone allow him to murder and drown and order war, to throw people into a lake of fire?
If God exist and morality is grounded in him, then the sense of morality I possess comes from him. My ability to judge his actions as abhorrent stem from this God given gauge. So either there is something wrong with my sense of justice or there is more to the account than I am aware off.
If God doesn't exist, then all we are are lumps of well organized clay telling other lumps of clay how they ought to behave. In this version of reality our sense of right and wrong is grounded in the clay. The concept of right and wrong held by the mightiest lumps of clay tends be the right one. In a materialists world, might is right.
The only hope we have of being able to truely state that abhorrent actions are objectively wrong, is if there is a source of morality beyond the mere attributes of matter.
So although we don't understand all of his actions and as a consequence feel uninclined to worship him, he does provide hope of ultimate justice being accessible to all. This can only be achomplished in an afterlife. It may even make him more likable in the end.
Someone once said "Everything will be ok in the end, and if it's not ok, it's not the end."