It's something of a cop out to say "Common Sense", but I don't feel bad about raising a red flag on things like mandatory circumcision (not Christian, but Jewish, and Christianity claims the same God), genocide on wicked peoples to include infants and livestock (I can buy a culture becoming so corrupt that everyone indoctrinated into it would need to die, but why hurt the babies?), a lot of Mosaic law on sexuality, that kind of thing. I can't rule out that it all makes sense given enough wisdom (which God would presumeably have), but it's got to count as a source of questions.