The Bible states so.
If Mary was so PERFECT, then why did Jesus bother to die for a PERFECT MORTAL?
That's because even Mary was NOT without SIN.
Mary is just another sinner.
No mere mortal is PERFECT or without sin. ONLY Shrist who walked the earth is without sin.
Yes, Muslims and Catholics have much in common - adoring and praying to a SINNER. For Muslims, it's SATAN.
Where in the Bible does it say the mother of God is a sinner?