i'm not apologetic about this.
it's a good question - can we just kill them all? would that actually work?
but, we need to learn from history. we've tried that. repeatedly. and, no - it doesn't work.
the lesson from history is that the best ways to get rid of religion are through education and wealth redistribution, not through violence and coercion.
and, that's a lesson any anarchist should see value in teaching.