" . . . Catholics ask Mary to do only what God has the power to do?"
Only God can pray to God?
That's what you're saying and it's just plain stupid.
Jesus Christ told us to pray and we're told to pray for one another. The real issue is whether or not someone believes Jesus Christ was telling a lie when He said He is God of the living not of the dead.
People who have no life in them always end up directly contradicting Jesus Christ, though, so we understand. We'll pray for you and ask Mary to pray for you as well.