Exactly what the title says, Christianity in all its various strains still stems from the horrendous old testament, and with all the awful shit that endorses, as well as with things like Calvinism and the general doomsday cult foundations in the religion, why do some people still act so charitably towards it? Christianity has proven itself to be a morally corrupt and oppressive institution at every turn. Or maybe I'm just too negative? 
EDIT Ok guys I get it this was rather reductionist, and I definitely was disregarding all the good that religious folks have done, and that religion has inspired people to do, but again over correcting into enthusiastic support for religion can also be problematic.
Surface-level interpretation.
Every religion gets swarmed and contorted by reactionaries because they see they can use it as a source of power, never mind how there is almost always pro-social, anti-oppression, and anti-stratification principles at the core.
This kind of New Atheist position ends up having the same approach to the Bible that fundies do.
You mean the Jewish scriptures, right?
So where is the billion plus movement of progressive religious people then?
Liberation theologies have quite a bit of influence in Latin America, Palestine, Ireland, and among Black communities in the US.