Jesus cannot atone possibly

The atonement and the related issues have been discussed by Hazrat Mirza Tahir Ahmad and analyzed as under:-

How could Jesus be born innocent when he had a human mother? If the sin of Adam and Eve had polluted the entire progeny of this unfortunate couple, then as a natural consequence, all male and female children must inherit the same genetic propensity to sin.

Females were perhaps more likely to because it was Eve who as the instrument of Satan enticed Adam. Therefore, the responsibility of sin falls squarely on the shoulders of Eve rather than of Adam.

In the case of the birth of Christ, obviously it was a daughter of Eve who contributed the major share. The question that very powerfully arises is whether Jesus inherited any gene bearing chromosomes from his human mother or not. If he did so, then it was impossible for him to escape the inevitable inherited sin. If he did not inherit any chromosomes from his mother either, then indeed that birth would be doubly miraculous.

Only a miracle could produce a son who neither belongs to his father nor to his mother. What remains incomprehensible is why those chromosomes, provided by Eve, did not carry the innate tendency to sin to the child Jesus.

Suppose it happened somehow, and Jesus had that innocence needed to carry the sins of mankind, on condition that they believed in him and not otherwise, another problem would arise: what happened, one may ask, to the progeny of Adam and Eve that died before the dawn of Christianity? How many billions of them might have got scattered throughout the world over five continents generation after generation. They must have lived and died without hope or even the possibility of ever hearing about the Christ their Saviour who was not yet born.
In fact the entire humanity between Adam and Christ seemed certainly to be doomed for ever. Why were they never given even a remote chance to be forgiven? Would they be forgiven retrospectively, by Jesus Christ? If so, why?

In other parts of the world, much larger by comparison to the tiny land of Judea, where people had never heard of Christianity even during the life time of Jesus Christ, what happens to them? They never did, nor ever could, believe in the ‘Sonship’ of Jesus Christ. Will their sins go unpunished or will they be punished? If they go unpunished, for what reason? If they are punished, again by what logic? What chance did they have anyway? They were totally helpless. What a distorted sense of absolute justice!

http://www.alislam.org/library/books/christianity_facts_to_fiction/index.html