What does the Bible say about corrupt religion?

In Mark 11, Jesus confronts the corruption of religion symbolized by a fig tree that appears fruitful but only has leaves. This passage emphasizes that true worship and genuine faith are essential, while empty religious practices are condemned. The people of Jerusalem, despite being at the center of Jewish worship, had transformed their faith into a hollow routine devoid of the spiritual fruit that God desires. The passage serves as a stark reminder that God looks for genuine devotion rather than mere adherence to rituals and traditions.