Bowing to Jesus Christ is not a sin.

Let's take this silliness to it's natural end: if the symbol of Christianity is idol worship then the physical bible and the Written Word is also idol worship because all three are symbols of Christianity and Jesus Christ.

But that's fucking stupid because no Christian worships pieces of wood or prays to a book.

Idol worship is a sin, but what you and Hortance can't seem to comprehend is the cross is neither an idol nor worshiped. It's a symbol in exactly the same was as written language or hand gestures. It's a symbol in the same way as Christians who have photos of their children on their office desks or in their wallets... and no, you don't know any Christians who leaves tribute to photos of their children.