It makes no difference what I think about any other faith or any other Christian denomination. I learn and follow Catholic teaching, while others learn and follow other teachings. Just as I never expected everyone to follow the college major I pursued, I never expected everyone to pursue the same faith I chose. But then I was born into an extended family of several Christian denominations and a few atheists, so to me that was the norm.
Mary's conception and what happened to her personally isn't something I dwell on. That is Mary's personal life, her story. If someone had bothered to ask me, I would have said, "That is Mary's business and we shouldn't be gossiping about something so personal. It has no affect on us." Obviously, the Church disagreed, and thus I know the story, the history, the decision. To some of the earliest Christians it was an important point, and I respect those traditions. Further, it seems it was important to Mary as well, because as late as the mid 1850s, she introduced herself with this title.