obviously you have huge misconceptions of Catholics.
I'm a protestant-agnostic, but I know my church history.
The pope isn't their god, or their mediator, or anything like that, he is like their president, kinda like a world-wide pastor.
Another big misconception is the prayer to mother mary. Again, she isn't a mediator, a god or something like that. To them, it is like asking a close friend to pray for them in hard times. They don't believe that their prayers won't be heard without them praying to her, but again, it's like asking a close friend to pray for you in hard times.