Knowledge about god
I've read a lot recently from members of the Abrahamic faiths that their god is somehow "different" to humans when it comes to decisions. Apparently his ways are not our ways and he is not bound by our ideas or morality. He can order the deaths of men, women, and children (Numbers 31:17). He can order the slaughter of babies (1 Samuel 15:3). He can deliberately kill all the first born sons (Exodus 12:29) or just send bears to do his dirty work (2 Kings 2:23-24).
But he doesn't approve of abortion, apparently.
You can do this for any action apparently undertaken by the god of Abraham. Murder is wrong, except when this god does it or orders it. Slavery is okay, rape is okay, but morality comes from their god. It seems inconsistent to me but apologists explain this by saying that their god is mysterious. William Lane Craig says that the murder of thousands of people is good because they are brought closer to his god as a result rather than being allowed to live in wickedness.
This leaves us with a quandary if we accept this claim rather than dismiss it utterly. If the god of Abraham's ways are not our ways, if this god's works and actions are a mystery, as is claimed, then what can we know about this god? What demonstrable, repeatable, actionable knowledge can we have about the god of Abraham?