My understanding of the Council of Nicea is that the smaller, more organized group got everything they wanted. The larger group which wanted more gospels showing Jesus as more human got zip. I learned that in an advent study where we were studying the early Christians. I have also read the book of Thomas and it is unlike the four gospels.
My sil is a fundamentalist and she has never heard of the Council of Nicea. She has no interest in knowing ancient history. She believes every word in the Bible is from God and asks no questions. I tried asking her about shrimp but to her way of thinking God changed his mind. I don't know why she doesn't think that God has changed his mind about other things. She absolutely doesn't want to hear about social class regarding homosexuality in ancient times.
Her pastor decided God wanted him to be a pastor and has had no formal training. Both of my pastors were trained and one has her doctorate. When she gives a sermon we also are given historical context.
She also believes that no Catholic, Mormon or any other religion will get to heaven. She includes them all in her belief they will be in hell and that is another question. In her heart she believes the only way going to heaven is her type of Christianity. I have always sort of thought she thinks I am headed to hell too because I am very liberal.