Christ is sinless. He’s fully Man and fully God. How can he be sinless and yet the son of a sinful Mary?
Ball’s in your court.
Your issue with Tradition is sad, because Tradition came first, before the bible. Scripture and Tradition are authoritative.
You say “He’s fully Man and fully God” yet you say He was not fully man because He did not carry our sinful side. Double speak?
He had to be born of sinful man (Mary) in order to inherit (carry) the sins of Adam. Our minds cannot comprehend totally how that worked but it must have for our salvation to be possible.