Where is that exactly in the bible, that we are to pray to Mary or for that matter to those who died and are in heaven? I pray eveyrday as well on all occasions as the Paul said too, I do not pray too anyone except God the Father in Jesus name. I do ask for help from the Holy Spirit and Angels though.
I'm Catholic and the Catholic Church has a long tradition of devotion to Mary and the Saints, as I'm sure you know. If you're interested in learning more about the Catholic faith, there are lots of resources available. Catholics believe, just as Protestants do, that the only way to the Father is through the Son, Jesus Christ, the Messiah.
Let me just say that perhaps we should look at the bigger picture and concentrate on our commonalities as Christians who love and serve the Lord. You may find the following thread interesting:
http://www.freerepublic.com/focus/f-news/1753534/posts