The black god was revered early on even in Christian communities, including Rome, and his worship was widespread throughout Europe.
However, when Theodosius, became the Christian ruler, and Christianity finally usurped the political system in Alexandria, Christian mobs eagerly went about destroying rival faiths, and labeling the latter ''pagans'' a pejorative term, denoting an inferior stage of thought. http://www.vinland.org/scamp/grove/kreich/chapter4.html
The emperor of the time rallied the fanatical Christian mobs in a tide-like frenzy destroying the Alexandrian library and the temple of Serapis, tearing up, breaking, looting everything in sight.
The Christians gloried in their sacrilege and impiety. Christians and monks alike terrorized many into conversion. Monks were installed in places that the Christians had desecrated. Pagan statues and art works were stolen, destroyed by the Christians, and pictures of the black goddess ‘Isis’ with her son Horus, became reinvented by the Christians as pictures of the Madonna with Child. The Egyptian crosses (ankhs) that you see in Christian churches today was originally displayed by Christian mobs to show their triumph over the Egyptian gods. The truth is early on Christians despised the cross. The Church Father, Minucius Felix, writing in the early part of the third century, severely rebukes the Pagans for their adoration of crosses: "I must tell you that we neither adore crosses nor desire them; you it is ye Pagans … for what else are your ensigns, flags and standards, but crosses gilt and beautiful."
Later the Christians even took the ‘staff’ belonging to the ‘black god’ and to mock him; the Christians placed or pictured the black god’s staff in the hands of their new version of 'Osiris'….. The Carpenter-King named ‘Jesus.’