Quote Originally Posted by LegioXXXUlpiaVictrix
Arrianism was no heresy, it was a last attempt to stick to the original Christian belief that among the catholics and orthodox was destroyed in the series of church meetings in the 5th, 6th and 7th centuries. The arrians only stuck to the Christian teachings that also those who later became orthodox and catholic had once admitted but found it useful to abandon, unless I'm remembering it completely wrong.
You remember it completely wrong. It had nothing to do with an original belief, but about the creation of a more complex and uniform doctrinal corpus to support and lead the growing Christian community. Those 'church meetings' were the concilia, universal debate meetings that joined representants from all the Christian world. Arrian of Alexandria was a bishop that negated the consubstantiality of Christ and God the Father. In the Nicea concilium of 325 AD, all church representants admitted this consubstantiality and adopted the Trinity dogma, which had been a constant teological topic since the early times. Arrian's doctrine was condemned as heretic, and he was exiled. One of his followers, bishop Ulphilas, preached Christianism among the germanic tribes, and thus arrianism converted into both Goths and Vandals version of Chriastianism, and a sign of identity against the influence of Greek-Roman Christian world.

Arrianism was an heresy since it was condemned as such by the successive concilia. And the topic about Trinity and the double nature of Christ, and how to concile this with monoteism, was a hot sophisticated debate that had nothing to do with the earliest Christian doctrines of St. Paul and such.