Then I think you are the confused one, as they mean the same thing but one is US and one is UK+NZ+etc.: https://en.wiktionary.org/wiki/sceptic#English

I think you’re reading “sceptic” as “septic”. They are not the same word.

Damn it - well, I'll never live this one down, I'll learn to shut up next time

About as funny as “confusing” color and colour. Which is to say: not very.

Skeptic and sceptic are pronounced identically, because they are just different spelling of the same word.

Sure, live in shame, but don't let go of the humor in it all :)

Sceptic is the UK spelling of skeptic.

Maybe you've confused it with septic?

How do you mean? Guy was born and raised in New Zealand and is using British spelling. There is nothing confused or confusing about this.