Using only the Bible to answer these questions since you say I am denying the Bible:
Was Mary sinless?
Did she remain a virgin?
Was she taken up into Heaven?
Are we to make icons of Mary and put them in our homes and "venerate" them?
Is anyone saved through Mary?
Are we to pray to Mary in any fashion?
Are we to rely upon Mary for anything regarding our salvation?
Using your parameter of the Scripture, none of these positions are found in the Scriptures.
So if catholic teaching on these these aspects of Mary cannot be found in Scripture, why should I believe what the RCC says about Mary being the "mother of God" when that title is never used to describe Mary?
It is a false attempt by the RCC to elevate Mary to a position not given to her in the Bible.
And he said, Hear ye now, O house of David; Is it a small thing for you to weary men, but will ye weary my God also? Therefore the Lord himself shall give you a sign; Behold, a virgin shall conceive, and bear a son, and shall call his name Immanuel.
But while he thought on these things, behold, the angel of the Lord appeared unto him in a dream, saying, Joseph, thou son of David, fear not to take unto thee Mary thy wife: for that which is conceived in her is of the Holy Ghost. And she shall bring forth a son, and thou shalt call his name Jesus: for he shall save his people from their sins. Now all this was done, that it might be fulfilled which was spoken of the Lord by the prophet, saying, Behold, a virgin shall be with child, and shall bring forth a son, and they shall call his name Emmanuel, which being interpreted is, God with us.