It seems, though, that the question was not framed in such a way as to allow for people who
believe that one of the seven "days" of creation was millions of years, and that evolution and the big bang are true, but God, a god, or the gods started the whole process - where do these people fit in the scheme of things?
Personally I believe in a multiverse in which universes appear and disappear due to the effects of black and white holes (many physicists have adopted this view), and where the processes of evolution, emergence and collapse are the physical correlates of the thought processes of the mind of the Universe.
Without further research, it's not possible to determine the exact thinking process of those who agreed that both the theory of evolution and creationism are true. It may be, however, that some respondents were seeking a way to express their views that evolution may have been initiated by or guided by God, and told the interviewer that they agreed with both evolution and creationism in an effort to express this more complex attitude.
- 24% of Americans believe that both the theory of evolution and the theory of creationism are probably or definitely true
- 41% believe that creationism is true, and that evolution is false
- 28% believe that evolution is true, but that creationism is false
- 3% either believe that both are false or have no opinion about at least one of the theories