How does / can Islam justify stoning women to death for adultry under mainstream Shariah law?

For the record; I am an athiest with an interest in religion and I have read the Qu'ran several times. Within Sharia law, there are a group of "Hadd" offenses such as pre-marital ual , by divorced persons, post-marital , adultery, false accusation of unlawful , drinking alcohol, theft, and highway robbery. Hadd ual offenses carry a sentence of stoning to death or severe flogging. Chapter 24 of the Qur'an, explicitly instructs believers to whip those found guilty of adultery. It's not contemporary or even based on real world science, EXAMPLE; under an obscure tenet of Islamic law an embryo can 'sleep' for years before swelling a woman's belly thus it is believed that an interval of up to 7 years can p between conception and birth. This means that a woman who is pregnant and has been divorced for fewer than seven years can theoretically claim the father of the fetus is her former husband. Is that the acceptable face of Islam?