How to argue against this claim

[The Valkyrie]

Hi All,

So Obviously the Bible and god ways are full of evil deeds, and EVIL agenda
Slaves, murders and much more

Some Religious person would say,
Yeah but think of a child that sees a doctor cutting a man legs to save his life.
So like us the child lack of understanding the big picture.

Please give smart way to explain this comparison

Thanks

There's a difference between surgery on a leg and genocide.

One important factor is that no one dies.