**Catholics don’t pray to Mary, we ask Mary to pray for us.**
You’re assuming that Mary can hear you. I find no record in the EPISTLES of any prayers to any of the deceased.
But you could make up the rules as you go, and say that it is possible to make request to the deceased.
Whoops, the RCs have already thought of that, so it must be true.
So I guess the question is: Where did the Bible come from?
It came from the Church. There are no contradictions with Catholic teaching since the Bible was written by, preserved by, given by, the Catholic Church.
Before the Bible all teaching was oral. And before the printing press most people did not know how to read. How were they to know the teachings of Christ if they had no one to tell them?
As a convert, I know that the Church is given to us by Christ. And every day I thank God for making me Catholic.
Again... if Mary doesn’t have eternal life via the promise contained in John 3:16, I don’t know what chance you and I have any theology that holds her to be deceased.