What is idolatry? Idolatry is idolatry is trusting in created things rather than the Creator. This is the 17th question in the New City Catechism and it teaches us a lot about our culture today. What we learn is that worship is transformational and idolatry also has a transformational effect on us as people. Memory verse for this question is Romans 1:21 and 25, but I would suggest memorizing more. You can re-read all of Romans 1:18-32. Remember that this was written in the first century as Paul reflects on the idolatry of the ancient world.