And to answer you last question, if someone was sacrificing chickens before an icon, that would be idolatry. If they believe the image itself was a god, that would be idolatry. The only example I am aware of of something like that would be in Santeria, but there you have Christian images being used to worship pagan deities.
“And to answer you last question, if someone was sacrificing chickens before an icon, that would be idolatry. “
Chickens are forbidden sacrifices but not flowers or incense?