1. All Christians honor Mary, of course. The only issue, I suggest, is when does honor cross into worship. It seems to me that many, probably most, Catholics actually do worship her even if that is not the teaching of the Church. There also seem to be those within the Church who see her as a co-redeemer with Christ. This troubles me.
2. Take the doctrine of Immaculate Conception, pronounced in 1854. This means that Mary is the only human being born without original sin. Set aside the issue of original sin for a moment (I have a problem with that, frankly - it seems so unfair to saddle innocent babies with that at their birth, guilty already). Anyway, why is it important that Mary was born without original sin? That strikes me as a way of setting her off for special adoration, etc. By the way, who was her mother? I don't find any reference to a St. Ann in the Bible, and I even recall that the Catholic Encyclopedia isn't very emphatic on the matter. But many churches are named for her, especially it seems among French-Canadians. (I come from such lineage.)
3. Now, take the doctrine of the Assumption of the Virgin Mary, proclaimed quite late - 1950. I wonder if that is another johnny-come-lately doctrine without foundation in scripture. My study shows that Mary wasn't adored as she is by many today until the 3rd century, even later. Was that borrowed from cults of the time, most of which had virgin goddesses?
4. Okay. No one seems to explain why nowhere in the epistles of Paul is Mary even mentioned! Paul obviously was providing essential doctrinal guidance to early Christians. If Mary should have been given such a central place in Christian worship it seems that he would have at least mentioned her.
5. Between the nativity and crucifixion sagas in the gospels, Mary seems to be mentioned in only two brief passages. On both occasions Jesus appears to me to treat her dismissively. Who is my mother? he asks. (Matt. 12:48 and Mark 3:33). Then, he turns to his disciples and says: "Here are my mother and my brothers." See also Luke 8:19-21. At the wedding in Cana, Jesus asks of her: "O woman, what have you to do with me?" You must admit, strange statements by Christ
By the way, as many of you probably know, there is more in the Koran about Mary than in the Bible. The Muslims believe in the virgin birth of Jesus, something millions of Christians doubt.