I quoted you. You don't have to be at the level of Adolph Hitler (a non-Christian idolater) to commit idolatry.
I agree and here is an example.
The children of Israel were worshiping the LORD God who delivered them out of Egypt with great miracles. Aaron was God's chosen high Priest but when the people became worried about Moses delaying upon the mountain for so long, some among them felt like the people would fall away unless they had some way of worshiping and keeping faith that Moses would return. Well, Aaron succumbed to their concerns and agree to form them an idol
so THEY COULD WORSHIP THE LORD!!!! Out of the fire came a calf ... and they worshiped the idol.
Even though they intended to worship the LORD God with it they were worshiping a figure that did not represent HIM at all!
The true God is a living God. Also, HE looked like mankind (aka Adam - actually Adam looked like HIM for God had his image before HE shared the likeness with Adam - oh well). This lifeless of a bull certainly did not represent the true identity of the living God.
They believed in the LORD... but they practiced idolatry at that time. God severely punished them. This is why I think God was severe at that time:
God was sanctifying the truth about himself in the eyes of his people and the world. If he were to be misrepresented in the eyes of the world then that falsehood had to be corrected... for it would mislead all people about who he really was. People would always think he was a bull!
So I agree with you. You don't have to be a non-Christian like an Adolph Hitler to commit idolatry. The children of God in Moses's Day committed Idolatry. I did not even know Hitler worshipped an idol.