First, I must acknowledge that there is no explicit verse that directly settles this issue. At the same time, I don't think that an explicit verse is necessary to prove that something is scriptural. I think that if a doctrine is implied in Scripture or logically follows from what we find in Scripture, and if there is nothing in Scripture that directly refutes it, then that belief can be considered scriptural. I think most people agree with me on that point, but it bears repeating, especially when considering the Marian dogmas. When it comes to Catholic beliefs about Mary, people tend to place demands on the evidence they will accept that are way more stringent and unyielding than the demands that they place on their own beliefs.
Romans 3:10, 23, 5:12, Luke 2:24 (Leviticus 12:8) directly refutes the idea that Mary was sinless. The Catholic church is clearly at odds with scripture.
When will you come out of her?