What is the Catholic response to those who think the Rosary an idol?

I noticed that Catholics pray to statues of Mary, and pray using Rosary beads. When I ask Catholics why they pray to Mary instead of God they tell me that they just show Mary respect for being a sinless woman. I take issue with both points because Mary was not sinless her entire life, only Jesus was, and the Bible says that prayers are between you and God without any middle man. Also, there is a difference between showing respect and worshipping, and it looks to me more like the latter than the former. The Bible says not to use any prayer tools and a Rosary qualifies as a prayer tool. On top of that it is not mentioned in the Bible so where did the Rosary come from originally? I also disagree with Christianity using Jesus on the cross as their image because God said that he doesnt want any image to represent him. Christians dont worship the cross though so I dont label it as idolatry. How does Catholicism reconcile all of these biblical contradictions? *I am not trying to insult the religion, these are genuine questions with no malicious intent behind them. I apologize in advance if this offends anyone*