His argument about Biblical prophecy requires the Bible to be a literal historical narrative, and he realised that this was called into question by the difference between the time-scale of Creation in Genesis and the age of the Earth as revealed by geology.
[5]: 162 [6] Since his premise was to make sure that science and scripture were in agreement, McCausland understood that if Adam were to be the considered "the progenitor of all mankind" then the Biblical account of creation would be inaccurate.
[8]: 164 The "Adamite" was a special divine creation whose history was recorded in Genesis; all other races were supposedly incapable of higher thought or cultural development.
Since Cain had been expelled from the area, the Cainites survived the Flood, continually moving eastward and ultimately settling China, where their knowledge and skill laid the foundation of Chinese civilization.
[7]: 164 In his book The Builders of Babel, McCausland writes that human civilisations evidenced by the ruins of Egypt and Mexico had been created by an extinct "Hamitic race of Babel-builders.