Answer:
Religion. Twain was a Presbyterian. He was critical of organized religion and certain elements of Christianity through his later life. He wrote, for example, "Faith is believing what you know ain't so", and "If Christ were here now there is one thing he would not be – a Christian".
example Religion is a set of beliefs about God or the supernatural. An example of religion is Christianity. A cause, principle, or activity pursued with zeal or conscientious devotion. A person for whom art became a religion.