Why do theist often drop the letter s when referring to atheists?

[I_am_not_mafia]

Lol, I'm pretty sure this was just a typo Mathilda...

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I can now add Huggy to the list.

....pretty sure this is a typo as well

But many theists do always drop the S, far too many times to be called a typo. Yet no one ever admits to it or realises that they are doing it.

I can see that it could be a typo for many though because the word atheist ends with a sort of s sound, but I never see atheists make the same typo when they mean theists.

I think it's more likely that people have unknowingly picked up the habit from reading anti-atheist literature.