I'm at least willing to entertain the notion of ENTJ, but it seems highly implausible. When someone has dominant Te, they are more driven toward management and are prone to take on roles of responsibility in which they dictate, enforce, and manipulate principles that directly affect people beneath them. Politician. Principal. Manager. CEO. Lawyer.
Dawkins is more of a lone wolf, and less of a doer than a thinker. I personally think INTx is pretty clear cut, in this case. But then again, you provided no analysis.