"True Christianity! Let us mind that word true. There is a vast quantity of religion current in the world which is not true, genuine Christianity. It passes muster, it satisfies sleepy consciences; but it is not good money. It is not the authentic reality that called itself Christianity in the beginning.
There are thousands of men and women who go to churches and chapels every Sunday and call themselves Christians. They make a profession of faith in Christ. Their names are in the baptismal register. They are reckoned Christians while they live. They are married with a Christian marriage service. They mean to be buried as Christians when they die. But you never see any fight about their religion! Of spiritual strife and exertion and conflict and self–denial and watching and warring they know literally nothing at all.
Such Christianity may satisfy man, and those who say anything against it may be thought very hard and uncharitable; but it certainly is not the Christianity of the Bible. It is not the religion which the Lord Jesus founded and His apostles preached. It is not the religion which produces real holiness. True Christianity is a fight."
-J.C. Ryle, from the book Holiness