These essays argued for a conciliation between Darwinian evolution and the tenets of theism, at a time when many on both sides perceived the two as mutually exclusive.
Gray said that investigation of physical causes was not opposed to the theological view and the study of the harmonies between mind and Nature, and thought it "most presumable that an intellectual conception realized in Nature would be realized through natural agencies." Thomas Huxley, who strongly promoted Darwin's ideas while campaigning to end the dominance of science by the clergy, coined the term agnostic to describe his position that God's existence is unknowable.
The Reverend Charles Kingsley, for instance, openly supported the idea of God working through evolution.
In 1927 John Ambrose Fleming was made president; while he insisted on creation of the soul, his acceptance of divinely guided development and of Pre-Adamite humanity meant he was thought of as a theistic evolutionist.
At the beginning of the 19th century debate had started to develop over applying historical methods to Biblical criticism, suggesting a less literal account of the Bible.
According to a 2014 Gallup survey, "More than four in 10 Americans continue to believe that God created humans in their present form 10,000 years ago, a view that has changed little over the past three decades.
Half of Americans believe humans evolved, with the majority of these saying God guided the evolutionary process.
Within the Christian world creationism was once widely believed to be true, but since the mid-19th century evolution by natural selection has been established as an empirical scientific fact.