I don't see how you can be sure about, when there is so much disagreement about the meaning of good. Human preferences are complex because they are idiosyncratic, but why would a deity, particularly a "philosopher's god", have idiosyncratic preferences? And an omniscient deity could easily be a 100% accurate consequentialist..the difficult part of consequentialism, having reliable knowledge of the consequences, has been granted...all you need to add to omniscience is a Good Will.

IOW, regarding both atheism and consequentialism as slam-dunks is a bit of a problem, because if you follow through the consequences of consequentialism, many of the arguments atheism unravel: a consequentialist deity is fully entitled to destroy two cities to save 10, that would be his version of a trolley problem.