The argument here is circular. It follows a line of reasoning that presumes that Mormonism is the only true Church, therefore anything that disagrees with a Mormon view must be false. Thus any evidence from the first few centuries of the Church that disagrees with mormonism must be apostate. Your logic is tantamount to saying I am right because I am right. It ignores the possibility that Mormonism could be false and provides no justification for the claim. In order to make your case, you must demonstrate that most of the followers of Jesus embraced what Mormonism teaches and then betrayed those teachings.
What evidence of apostasy do you have? When did your proposed apostasy occur?
There are many historical resources from the Apostolic Age that indicate that traditional Christian doctrines (that I presume that you are calling apostate) were taught well before the Councils of Nicaea or Constantinople. For instance, you have St. Ignatius of Antioch ordained bishop of Antioch by Peter and a personal pupil of the John the Apostle wrote that the bread and wine of the sacrament were really and truly the flesh and blood of Christ. He wrote in the 1st and 2nd Century A.D. and was martyred in 107 A.D. He obviously was no coward and would rather die than apostatize which give some degree of weight to his teachings. There is also the Didache of the Late 1st Century A.D. which disagrees with many Mormon positions concerning doctrines of baptism and the Lord's Supper, etc. Tertullian discusses the Trinity in the third century and is the first to use that word, but the concept is discussed earlier. Other sources concerning the Church from the time of the Apostles are Clement of Rome, Polycarp of Smyrna, etc. The list of sources from before Nicea and Constantinople goes on all of the way back to the time of the Apostles and they are very supportive of Traditional Christianity.
What evidence of apostasy do you have? When did your proposed apostasy occur?
There are many historical resources from the Apostolic Age that indicate that traditional Christian doctrines (that I presume that you are calling apostate) were taught well before the Councils of Nicaea or Constantinople. For instance, you have St. Ignatius of Antioch ordained bishop of Antioch by Peter and a personal pupil of the John the Apostle wrote that the bread and wine of the sacrament were really and truly the flesh and blood of Christ. He wrote in the 1st and 2nd Century A.D. and was martyred in 107 A.D. He obviously was no coward and would rather die than apostatize which give some degree of weight to his teachings. There is also the Didache of the Late 1st Century A.D. which disagrees with many Mormon positions concerning doctrines of baptism and the Lord's Supper, etc. Tertullian discusses the Trinity in the third century and is the first to use that word, but the concept is discussed earlier. Other sources concerning the Church from the time of the Apostles are Clement of Rome, Polycarp of Smyrna, etc. The list of sources from before Nicea and Constantinople goes on all of the way back to the time of the Apostles and they are very supportive of Traditional Christianity.
Thank you for a very articulate and accurate comment.