Note that he uses the word "could"...While I believe in God, it would appear, I think, to those who use only their senses to tangibly determine what is or is not, God is only a theory and therefore 'could' exist ...Always look for the words "could", "perhaps"... Its a dead giveaway that means NOT PROVEN.
For the strict creationsists, I think they have lost the battle before it is started on this basis; just as evolution cannot be strictly proven - neither can God be strictly proven, yet, whether he does exist or not is immaterial to fact ('facts' stand aside from and independent of what puny mortals may conceive in their limited minds at any given moment) ...
The 'creationsists' fail to address those common elements we find in DNA, those components that result in the formation of some rather 'common' elements that are shared with different so-called species. 'til they come to grips with this aspect they will be continually 'inventing' specious reasons for 'differences' they cannot explain and therfore reamain forever ignoring that rather large elephant (present for all to see) that occupies their front living rooms ...