Virtually everyone was Christian.

John Jabez Edwin Mayall/Wikimedia Commons
John Jabez Edwin Mayall/Wikimedia Commons
Religion has been a hot topic issue throughout England’s history, but by the Victorian age, the vast majority of Britons were members of some kind of Christian church. Anglican churches dominated as the state churches of England, Wales and Ireland.
Scotland’s state church was Presbyterian, while there were also smaller populations of non-Anglican Protestants. Small groups of Catholics, Jews, and Muslims existed as well, but they were a tiny minority.