Have you ever kneeled before a crucifix and said prayers to God?
Two points.
First off, whether he has or not, he's probably repented of bowing before an image.
The other thing is, at least he would have been praying to the RIGHT person - GOD.
You fail on both points.
I believe you will find that most, if not all, OTC Christians do not have anything to do with a crucifix as Jesus is not on the cross anymore.
When Christians pray on their knees it is an act of contrition and respect for God.
We can come to the great Throne of Grace as the Bible says, boldly come to that place.
We do not bow to anything except God.