Added following quote to "Secularisation: Religion Becomes Less Important" by Vexen Crabtree:

“Secularization has gradually permeated the Christian world. It led to the situation in which, by the nineteenth century, Christianity had ceased to have much real influence on the social and political life of Europe. The form was maintained, in that political leaders usually made a great show attending religious ceremonies and were often personally pious. Religion no longer had a role, however, in the shaping of political and social policy. Other considerations and other secular ideologies had taken over. Following the loss of social and political influence, religion became increasingly irrelevant to the lives of ordinary people also.”

"The Phenomenon Of Religion" by M. Momen [Book Review], p480