Is the devil responsible for all sin?

The Catholic Answers

Indirectly, yes, for he caused the fall of our first parents. Directly, no. Scripture tells us that the three great enemies of man’s soul are the world, the flesh, and the devil. Men sin for mere worldly prosperity, or induced by sensual passion. At times, however, Satan directly tempts them. But Satan can do no more than suggest evil to our will; he cannot compel our assent. Man can always refuse consent to evil by the help of God’s grace. “God is faithful, who will not suffer you to be tempted above that which you are able.” I. Cor. X., 13.

Radio Replies Volume 1 by Rev. Dr. Leslie Rumble MSC and Rev. Charles Mortimer Carty