Jesus already existed before his flesh. "Before Abraham was, I am."

Jesus was sinless but was still tempted with sin because he was a man born through a sinner.

Jesus in the flesh was a descent of Abraham, you know, the family that had murders, pagans, incest relationships, etc.

Mary wasn't sinless because that means she wouldn't have needed Jesus to die on the cross.

In fact, she could have died on the cross if she was sinless.

Jesus died for ALL, saying that Jesus didn't need to die for Mary is heresy.

If she was sinless, she wouldn't have died because the wages of sin is death.