Was the Buddha Humanist? Humanism is defined as,


  Humanism is a philosophical and ethical stance that emphasizes the value and agency of human beings, individually and collectively, and generally prefers critical thinking and evidence (rationalism, empiricism) over established doctrine or faith (fideism).


Would you say that the teachings (the Dhamma) of the Buddha are 'humanistic' in character, and if so - why?

I have heard many people using "humanist" in connection with the teachings. To me the teachings look more introvert with a guidance in social navigation in human society - a form of adaptive camouflage to avoid conflicts - but certainly not for humanistic purpose. To me it is seems more like the Buddha was teaching at a universal level including all mass.

But I might be mistaken, hence the question.
Whether or not Buddhism is Humanist depends on your interpretation of Buddhism.  

First, Buddhism is a program for humans to find happiness, and as such seems humanistic.  However, it does this by a thoroughgoing program of deconstructionism, which includes the self itself, and this may seem anti-Humanistic.  

Second, while Buddhism is individualistic in a sense, there is the Bodhisattva ideal, which aims at the benefit of all sentient beings, and some of the attempts at transcending ego can involve serving others, so some types of Buddhism can be seen as benefiting people collectively.  However, there is a movement for Engaged Buddhism, which would seem to imply that this view of Buddhism is not universal (otherwise, why make an effort to stress this)?

Third, although the Four Noble Truths talks of the futility of trying to find happiness through our typical pursuits (and paints what some say is a grim picture of life), it also teaches that we have the power to transcend our situation.  In this sense, it seems to value human agency.  On the other hand, we're taught that we're not independent selves and (some interpretations?) even try to transcend the sense of doership as the handmaiden of the self, and as such, human agency may be devalued.

Finally, some Buddhist teachings value critical thinking and/or evidence over faith (Kalama Sutra), but there's also a critique of rationality (see Madhyamaka deconstructionism, especially Nagarjuna's). 

In short, YMMV