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.
Because most people on this site aren't Marxists. It's as simple as that. They want to believe that religions that have been oppressing people for thousands of years can be reformed somehow. It's kinda baffling for a website with such a large LGBT+ userbase.
I like how easily we can answer the reform or revolution question in relation to literally everything else.