The Catholic Church basically says:
-The Eucharist somehow becomes the actual Body and Blood of Christ.
-They can't explain how, you're just supposed to accept it as some fantastic mystery.
-That's why their church is so awesome, no other church has that.
Really the logic is circular, they basically say you should be Catholic because of something that makes no sense unless you accept Catholic authority to begin with. I consider the whole thing nonsense, so of course I view it as idolatry.
This would be like me saying that my apartment is the best apartment in the world because it's magical apartment though I can't explain how. But because it is so magical my apartment rules and is superior to every other apartment in the world and if you dispute that, you are committing a grave sin by doubting the amazingness of my apartment.
Oh, I pity your heresy. To never know the fullness of Christ Jesus as the church fathers and companions of the lord did. To be bereft of a legitimate church and be led by 16th century invention. Our church and the eastern churches have a strong foundation that is not based on a kings balls or protecting princely title.