Hi Fez,
By coincidence, I was discussing this recently with a Catholic. They do not worship Mary, that would be unscriptural. But they reason that:
- Mary is in heaven.
- Mary has access to Jesus.
They do pray to her to interceed for them. This is like asking somebody here on earth to pray for you. You do not worship that person, but you reason that God might listen to their prayers. They sum it up with the saying, "If Father says no, then ask Mom."
My understanding is that it is Christian, and not a serious doctrinal problem. Worshipping Mary rather than God would be a problem.
Ken