That doesn't make her an intermediate, Jesus states many times that he is the only mediator, and that all you have to do is come to him with your sins and problems. Praying to Mary isn't biblical, she was only a woman who honored God, and even so she being human was also a sinner who needed a savior. Man has a knack for worshiping things before God, for example the Golden Calf. they were praying to God, but were doing it through the idol. One speculation of why God hid Moses' body from the devil was to prevent Ancient Israelites from making his burial place a object of worship. Anything you put before your relationship with God is idolatry, doesn't matter if its Tv/YouTube, or hobbies, even people. all I can say is use your own discernment.
as for the false religions thing Revelation 17
the old testament uses harlot as a metaphor for false religions