I do disagree with some of your views but not all. My point about sin was more about defining it from Jesus' perspective of the Pharisees. He saw their separation as sinful. 
The Church started by using the vernacular Greek in places where Greek was spoken, Latin where it was used. Thomas who is said to have started the Church in India would have likely used the local language to communicate.  Vatican 2 essentially brought it back to the beginning. The Church also needs to restore a more unified flat structure. The hierarchy separates the clerics from the laity. I think it is helpful to follow Jesus and focus on love as it more inclusive than separation.