I agree with my beloved and pious brother
@prodromos (whose posts I have yet to disagree with) and my dear Roman Catholic friend
@Xeno.of.athens who I do sometimes disagree with, but with whom I agree more than I disagree, that the Azusa Street incident was not akin to what happened in Acts 2.
Also, the idea that it was a good thing because new denominations emerged from it is deeply frustrating; what that actually means is that it caused a schism, which itself experienced another schism, since those present could not apparently retain doctrinal unity, and this is unfortunate, since the more divided the Christian Church becomes, the less effective we are.
The raison d’etre for ecumenical dialogue in the 20th century was to try to reverse this trend by reuniting churches that did not need to be separate, and restoring communion between churches who had become estranged from each other, in some cases due to misunderstandings.
Now not everything to come from the Ecumenical Movement has been good *; the Orthodox for example reject doctrinal compromise as a means of achieving ecumenical reconciliation.
This all being said, Christian unity is still a thing to be sought after, and the formation of new denominations usually represents a needless and schismatic act. **
*In particular, I have a very low opinion of the World Council of Churches due to its history of ill-advised political involvement and also the fact that it through naivete managed to allow the KGB to directly influence its political statements while the Soviet Union was still a force to be reckoned with, since the KGB exerted extreme influence via blackmail and threats of mass persecutions over churches behind the iron curtain, whether Protestant, Catholic or Orthodox, and so those churches located in Communist Countries were to a large extent held hostage and forced to say what the KGB wanted them to say, by, for example, by opposing military actions by NATO, or by overstating the extent to which religion was freely practiced in the Communist countries (while one could be a Christian, priests and pastors were effectively gagged, their ability to preach being greatly restricted, and their ability to criticize the state essentially a one-time ability, since if one did that one would disappear from the pulpit and find that one had been transported to prison and could look forward either to several years of hard labor in Siberia or the deserts of Central Asia or other equally unappetizing destinations, under brutal conditions with safety precautions and medical coverage that could best be described as inadequate, or else a bullet to the back of the head, depending on the year in which one made such an outbreak, the conditions facing the Soviet Union and its satellites at the time, and how directly one had criticized the Communist Party or its leaders, but frankly a bullet to the brain might well be preferable, since martyrdom in the Orthodox faith confers instant glorification and salvation (as does being tortured to the faith, but only after one dies).
Also unmentioned was the fact that all of the best-paying and most important jobs required Communist Party membership, and Communist Party members were forbidden from engaging in religious activities (other than those relating to the peculiar occult rituals of the Communist Party itself, like visiting the embalmed body of Lenin or whatever communist warlord had been the first dictator of the country one occupied. Lastly, there was one more problem, and a substantial one, that being that churches were forbidden from providing Sunday schools, parochial schools or catechism classes or other forms of religious instruction to the youth, which meant that while children could attend church, the extent to which they understood the faith was limited.
**The sole possible exceptions being when heterodox elements have taken over and corrupted the doctrine of an existing church, or in some cases, if a particular church is having organizational problems organizing missions, or if that church is being oppressed politically, and there is a need to form an underground “catacomb church” to compensate for that oppression as a temporary measure until the restoration of religious freedom, but in this case care must be taken to avoid perpetuating the existence of the latter, which would be schismatic. Thus, after the downfall of the Soviet Union, communion was restored between the various Orthodox churches outside of the Soviet sphere of influence, such as between ROCOR and the MP, and between the Armenian Catholicos of Holy Etchmiadzin in the Republic of Armenia (which had been annexed by the Soviets in the 1920s and became independent by 1991), and the Armenian Catholicos of the Great House of Cilicia (which was originally created to serve the Armenian Kingdom of Cilicia, during a brief period when there were two Armenian-ruled nations in defensive positions protecting the northern and southern approaches into Asia Minor, and what remained by that time of the Byzantine Empire. Likewise, the Lutheran Church in the DDR was unified with the Evangelical Lutheran Church in the Federal Republic of Germany when East Germany was reunited with the West after the fall of the Berlin Wall.
However, what we are talking about here are not really separate denominations per se, but rather separate local churches within the context of a single denomination, for example, Russian Orthodoxy or Armenian Orthodoxy or German Lutheranism.