Excellent cites! Thanks to all. I’ll attempt to synopsize.
My OP asked to support the contention that total rejection of evolutionary theory in favor of Biblical literalism (loosely described as ‘creationism’) is a minority belief among Christians. This appears to be confirmed.
Although adherents even within each denomination may vary in beliefs, thereby making it impossible to assign exact numbers to large groups, it still seems possible to reach some generalized conclusions.
Partial summary: (from http://www.strategicnetwork.org/pdf/kb16424.pdf - PDF!)
worldwide 2.1 billion Christians
breakdown:
1.1 billion Catholic
426 million “Independent” (“separated from, uninterested in, and independent of historic denominational Christianity”)
375 million Protestant
219 million Orthodox
79 million Anglican
34 million “marginal” (Witnesses, Mormons, Theosophists, etc)
Catholicism and derivatives (Anglican, Episcopal) state that there is no conflict between science, including evolutionary theory, and faith. Therefore at least 1.2 billion of the 2.1 billion worldwide Christians are not ‘creationists’.
It also seems likely that the Independents (as defined in the above paper) are unlikely to hold strong literalist views.
This leaves us with Protestants, some Marginals, and an unknown number of Orthodox. Taking them at 100% ‘creationist’ totals 628 million, or 30% of worldwide Christianity.
But this http://www.thearda.com/quickStats/qs_23_p.asp suggests that for American Protestants, when asked in a general social survey, at least 30% thought that evolution is either “definitely true” or “probably true”.
A number of the citations upthread state that Protestants outside the USA have much lower adherence to ‘creationist’ views, but no data (that I could find or extract) proves this. But it seems reasonable to assign at least the same breakdown of belief as for the USA subset of Protestants. So let us remove 30% of the 375 million Protestants from the ‘creationist’ camp, leaving 263 million.
Now, again assuming 100% ‘creationist’ views although this is hardly likely to be true, we are left with 263 million Protestants, 219 million Orthodox, and 34 million Marginals, total 516 million or no more than 25% of worldwide Christians.
I fully admit that these figures are based upon a number of suppositions, and the level of uncertainty is high. And I recognize that we are glossing over differences between ‘young earth’, ‘old earth’, ‘theistic’, ‘naturalistic’, and a host of other nuances. However, I believe that sufficient actual data is present to affirm the OP.
(I apologize for the links-- I seem to have lost the ability to insert a word [like linky] instead of a complete URL. Mods are welcome to fix, and anyone can backchannel me to fight my ignorance for inserting future links.)