TL;DR: Secular humanism can’t adequately ground objective moral values. If moral values are to be drawn solely from what we observe in nature, then they would need to align with the observed “ultimate purpose” of our universe…that is, heat death.
Bronze age tripe, that’s all it is
The scribblings of a goatherd
To call this tome a “holy book”
One must be quite the dotard
It’s full of nonsense, myths and lies
I hear it calls for slavery
My plain contempt can’t be disguised
Free Thought takes much more bravery
Free Thought, you say?
Do tell me more
You really have intrigued me
A system without creeds, you say?
No room for touchy-feely?
That’s right, he smirked
I need no God
My reason is sufficient
The Scientific Method guides my path (and it’s sufficient)
I draw my morals from within
Human nature never fails me
Deep down inside all men are good
Blind faith scares me
Blind faith, you say?
That’s not unique
To buildings with a steeple
Surely, then, you have a way
To ground your faith in people?
My faith in mankind needs no grounding
Surely you can see so
These things are Good!
Everyone agrees, no?
Said I to he
Though that would make me merry
The problem with your view, you see
And not to be contrary
Is that the virtues which you cite
Come off as arbitrary
You say that we’re the product of a mindless game of chance
Our fleeting lives in tune with Nature’s odd and wondrous dance
Yet if you think this through, sir, and use science as your guide
Then ought not moral virtues work toward Nature’s sure death slide?