I Cor 15: 21&22 For since by a man came death, by a man also came the resurrection of the dead. For as in Adam all die, so also in Christ all will be made alive.
The responsibility for sin entering the world is attributed to man. For one thing, Adam was with Eve when she ate, and HE WATCHED HER DO IT. He could have stopped her after he heard what the serpent said and he didn't. It was after he ate that THEN their eyes were opened, not after she ate.
I Cor 15:21 & 22 state that it was through *a* man that death came. *Man* as used here is not in the general sense of meaning *mankind* because it specifically says *a* man. Also the verse says "For as in *Adam* all die..." It doesn't say through Eve. It kind of removes all doubt about where the responsibility for sin entering the world comes from.
There's also the factor that Jesus had God as His father, thereby avoiding the sin nature that afflicts us and enabling Him to be able to be sinless and therefore be an appropriate sinless sacrifice for our sins. If the sin nature came through the mother, that couldn't happen.