“But RC doctrine include praying to Mary to “intercede” for us with “her son”.”
So Mary praying for us is us worshiping Mary? If I ask you to pray for my cancer stricken wife, am I worshiping you? If I ask you to mow my lawn am I acknowledging you as Creator of the universe?
Christ is the ONE mediator between us and God the Father.
There are no Scripture verses which instruct us to pray to dead people and ask them to pray for us.
There are no Scripture verses which afford Mary any unique intercessory position in relation to Jesus Christ.
There are multiple verses which tell us that Christ is the ONE mediator between God and man.