Protestant
Protestant views on abortion vary considerably. In Evangelical churches, especially in the United States, the view is widely held that abortion is infanticide and therefore always wrong. However this is not a universal view, and few Evangelical churches hold it as a doctrine. The Bible contains no specific prohibition on abortion, although several passages are widely held to indicate that life begins at conception, in which case a ban on abortion follows logically.
Few Protestant churches agree with the principle of 'abortion on demand'. More liberal protestants usually agree that there should be restrictions on abortion, and disagree over exactly what those restrictions should be. Anglican churches usually fall into this category.
Islam
Islam discourages abortion, but allows it as permissible under certain circumstances.
Hinduism
Hinduism teaches that abortion thwarts a soul in its progress towards God, like any other act of violence. It teaches that a fetus is a living, conscious person deserving of protection. Hinduism has traditionally taught that a soul is reincarnated and enters the embryo at the time the embryo is conceived.
Buddhism
Buddha advised against the taking of conscious life, as he identified such activity as a cause of suffering. Buddhism generally asserts that conscious life begins before birth. Therefore, many buddhists consider abortion to be equivalent to infanticide.