RELIGION A VS. RELIGION B
The 19th-century Danish theologian Soren Kierkegaard identified two kinds of religion--Religion A and Religion B. The first is "faith" in name only (2 Tim. 3:5). It's the practice of attending church without genuine faith in the living Lord.
Religion B, on the other hand, is a life-transforming, destiny-changing experience. It's a definite commitment to the crucified and risen Savior, which establishes an ongoing personal relationship between a forgiven sinner and a gracious God.
This difference explains why for many years British author C. S. Lewis had such great difficulty in becoming a Christian. Religion A had blinded him to Religion B. According to his brother Warren, his conversion was "no sudden plunge into a new life, but rather a slow, steady convalescence from a deep-seated spiritual illness--an illness that had its origins in our childhood, in the dry husks of religion offered by the semi-political churchgoing of Ulster, and the similar dull emptiness of compulsory church during our school days."
-- Our Daily Bread, March 15, 1994, 10,000 Sermon Illustrations