Humanism is about the individual ability to think for themselves without relying on other/external authority and you should be free to question authority also composed of self-doubt, a society where people are for themselves. Open mindedness, reason, mature, mental maturity, cognitive maturity, rationality ⇒ thinking
I have the capacity to think for myself.
Freedom of conscience = another component exp : protestants reforms who are against the Holy Roman Church/ Empire.
I am a humanist because I respect others religions and beliefs.
Century of religious wars we have reached some humanism in some countries
Humanism essentially embodies the Enlightenment motto "sapere aude!" That is, we are free to think for ourselves independent of any external authority. All human beings regardless of their background have this capacity to think for themselves. This is a universal attribute unique to being human. So, we are special as human beings because we have this capacity, which gives us autonomy and independence.