The north had home advantage
Christianity continued to spread because of many missionaries going out and Spreading the word of God. One other reason would have to be the spread of Catholicism which was Christianity but, later changed because of the Romans. This is my basic Knowledge but, I'm not sure if this is going to help but, here you go. :D
Financial institutions can help cities, towns and communities by providing financial stability to the community and giving them investment and capital possibilities. For example, providing loans and mortgages are examples of the important role of financial institutions.