Francis Schaeffer is credited with helping spark a return to political activism among Protestant evangelicals and fundamentalists in the late 1970s and early 1980s, especially in relation to the issue of abortion. In his memoir "Crazy for God," Schaeffer's son Frank takes credit for pressing his father to take on the abortion issue, which Schaeffer initially considered "too political". Schaeffer called for a challenge to what he saw as the increasing influence of secular humanism. Schaeffer's views were expressed in two works, his book entitled "A Christian Manifesto", as well as the book and film series, "Whatever Happened to the Human Race?".