In the latest issue of the DD comic it's stated clearly by Matt, probably to coincide with the netflix verse, that killing the Hand doesn't count as killing people. It's not killing because they're not alive. Resurrected Hand don't fall under his No Kill rule.

I really would like to know how this fits into his Christian belief of Jesus, tho? And not just him but Frank, too, since Frank has a history of being Catholic 'once'.