This argument holds weight in countries where the legal system is linked to a religious entity. In the Islamic Republic of Iran, where the state is based on its interpretation of Islamic laws, this view of abortion is understandable, for example. However, in most Western societies, our government prides itself on its secular philosophy. The modern secular society has a state free from religious influence and considers religious institutions as an entirely separate institution.
Therefore, to prohibit abortion on religious grounds would be a violation of Western democracy's secular principles. It would be an example of religious ideology influencing matters of government, a practice most Western societies abandoned during the Age of Enlightenment.