[Meph504]

I'm personally am unclear of what you are asking for?

what purpose or use do you want out this, if you want a practical lecture there are ample across many topics, with no religion involved.

A sermon by its nature is one of a religious or moral nature. and is often based around not literal matters.

what do you see what your asking for looking like?

All I can think of maybe something from the Unitarians (https://www.uua.org/worship/words/sermon)