Beautifully put Doc, however, might it not be easier for folks to comprehend if one simply says;<quoted text>
This is only one definition of the word, usually given as the second or third meaning in dictionaries. The shore of a river and the place where you deposit money can both be called banks. That doesn't make them the same thing.
The number one definition - the one that applies to Christianity - usually includes words like supernatural, god or deity, and worship: "the belief in and worship of a superhuman controlling power, especially a personal God or gods"
You are talking about two different things. Humanism is not a religion in the principal sense of the word, only in a metaphorical or second sense. It's closest to number 2 in this dictionary: "a specific fundamental set of beliefs and practices generally agreed upon by a number of persons or sects"
A third sense of the word is even more metaphorical, and implies an intense devotion as football might be to a fanatical fan: "a pursuit or interest followed with great devotion"
Humanism is no more like Christianity than it is like football, even though all three can be called religions using three different definitions of the word.
Humanism = Caring about all people and stuff.
Just a thought.