In Christianity,
Pope Sixtus V (1585–90) is noted as the first Pope to declare that abortion is homicide regardless of the stage of pregnancy;
[93] the Catholic Church had previously been divided on whether if believed that abortion was murder, and did not begin vigorously opposing abortion until the 19th century.
[91] Islamic tradition has traditionally permitted abortion until a point in time when Muslims believe the soul enters the fetus,
[91] considered by various theologians to be at conception, 40 days after conception, 120 days after conception, or
quickening.
[94] However, abortion is largely heavily restricted or forbidden in areas of high Islamic faith such as the
Middle East and North Africa.
[95] In Europe and North America, abortion techniques advanced starting in the 17th century. However, conservatism by most physicians with regards to sexual matters prevented the wide expansion of safe abortion techniques.
[91] Other medical practitioners in addition to some physicians advertised their services, and they were not widely regulated until the 19th century, when the practice was banned in both the United States and the United Kingdom.
[91] Church groups as well as physicians were highly influential in anti-abortion movements.
[91] In the US, abortion was more dangerous than childbirth until about 1930 when incremental improvements in abortion procedures relative to childbirth made abortion safer.
[note 2] The Soviet Union (1919), Iceland (1935) and Sweden (1938) were among the first countries to legalize certain or all forms of abortion.
[96]