to existing genetic engineering techniques. Thinkers who defend the likelihood of accelerating change point to a past pattern of exponential increases in humanity's technological capacities. Kurzweil developed this position in his 2005 book The Singularity Is Near. Intrinsic immorality It has been argued that, in transhumanist thought, humans attempt to substitute themselves for God. The 2002 Vatican statement Communion and Stewardship: Human Persons Created in the Image of God, stated that "changing the genetic identity of man as a human person through the production of an infrahuman being is radically immoral", implying, that "man has full right of disposal over his own biological nature". The statement also argues that creation of a superhuman or spiritually superior being is "unthinkable", since true improvement can come only through religious experience and "realizing more fully the image of God". Christian theologians and lay activists of several churches and denominations have expressed similar objections to transhumanism and claimed that Christians attain in the afterlife what radical transhumanism promises, such as indefinite life extension or the abolition of suffering. In this view, transhumanism is just another representative of the long line of utopian movements which seek to create "heaven on earth". On the other hand, religious thinkers allied with transhumanist goals such as the theologians Ronald Cole-Turner and Ted Peters hold that the doctrine of "co-creation" provides an obligation to use genetic engineering to improve human biology. Other critics target what they claim to be an instrumental conception of the human body in the writings of Marvin Minsky, Hans Moravec and some other transhumanists. Reflecting a strain of feminist criticism of the transhumanist program, philosopher Susan Bordo points to "contemporary obsessions with slenderness, youth and physical perfection", which she sees as affecting both men and women, but in distinct ways, as "the logical (if extreme) manifestations of anxieties and fantasies fostered by our culture." Some critics question other social implications of the movement's focus on body modification. Political scientist Klaus-Gerd Giesen, in particular, has asserted that transhumanism's concentration on altering the human body represents the logical yet tragic consequence of atomized individualism and body commodification within a consumer culture. Nick Bostrom responds that the desire to regain youth, specifically, and transcend the natural limitations of the human body, in general, is pan-cultural and pan-historical, and is therefore not uniquely tied to the culture of the 20th century. He argues that the transhumanist program is an