I’m not gonna defend the entire Bible here but that story was about Amalek, a specific people not humanity in general. Also they had some voodoo stuff in there about them transforming into animals. It was kinda out there.

The water of the sea drowning the Pharaos army chasing the israelites doesn’t seem like a moral dilemma to me.

The not killing part refers to not just killing anyone or stealing their stuff etc. Actual self defense is fine.

You can focus on the few war stories but I know a bunch of good Christians who have adopted kids, feed the poor and do a lot of charity stuff etc. The actual good stuff.