What has it done? It gave us the Inquisition, the dark ages and the "prosperity gospel" by the likes of Creflo Dollar, Joel Osteen, and Robert "Gasman" Tilton.
Christianity—like most religions—advocates that the corporeal world is evil and only hobbles you. Religions is the philosophy of death. Die to live forever. Yeah, I'll pass. I'd rather live now, fully.
Name one thing that we owe and is original to Christian philosophy
Western civilization, for better or worse. In b4 'Just a hinderance.' In some ways, undeniably, but the elemental character of a society/civ is its mythos. Sure it's bullshit but it might be the only glue that holds things together on a macroscopic scale.
So pretty much everything since Milvian Bridge, including reactions against church stuff, the good, the bad, and the plain fucking goofy. It's not the sole reason we're where we are now but it played a principal role.
I'm not talking heliocentricity or stem cell debates. I mean on a big broad scale. The structural stability and propagation of European civilization as the framework within which historical particulars exist. And I don't mean a conceptual framework by which we interpret those events. I mean a practical, real reason which allowed events to take place. Like if Christian Europe hadn't existed, Newton wouldn't have been born to privilege where and when he was and done what he did. There would have been a totally different timeline. If Charles Martel had to marshal a bunch of independent, free thinking atheists to battle instead of Christians convinced of the deliciousness of sky-cake, would the Muslims have conquered Europe? If Florence didn't like the Pope (in b4 ghibelline propaganda!) and Bruneleschi didn't complete the Duomo, and that dude who's name I can't remember didn't use its crazy height to take astronomical data, and Columbus didn't get the data, and didn't get funded by monarchs atop a stable state, and people later weren't convinced it's more than ok to slaughter non-Christians wholesale by way of manifesting God's intended destiny, etc. It's all connected.
Again, better or worse is worth speculation but that's not what you asked for. You asked for one thing Christianity has done. It defined and perpetuated the civilization responsible for everything that has happened up until now.