How do I convince someone that the Idolatry has become a problem again? They're smart but they've been seduced by Idols themselves, and have wandered away from

How do I convince someone that the Idolatry has become a problem again? They're smart but they've been seduced by Idols themselves, and have wandered away from my beliefs and my idols. Perhaps you ought to ask your friend why the "propaganda" has caught him?