Was Christianity the worst thing to ever happen to the world?

[President Punxsutawney Phil]

The alleged "Dark Ages" were mostly a myth.
Not to mention, the church was a leading player in science for literally millennia, as monks in particular helped keep the institutional cohesion of the West together. Of course, there was oppression towards the scientific community in some areas, but that does not nullify the former, it only makes it a gatekeeping institution (of which there has been quite a few in history, with widely varying effects).