Not all Christians believe the conquest of Joshua is really God’s idea or that all non-believers will experience eternal conscious torment after death. There is some latitude there.
You might be interested in the latest BioLogos podcast interviewing progressive Old Testament scholar Pete Enn’s: Peter Enns | God is Not a Helicopter Parent - BioLogos
There is a current discussion of the gory bits of the OT here: Inerrancy and mass slaughter