There is no obligation to have FC as part of your family's Christmas traditions, if you'd rather not.
My DC loved believing in FC, and totally got why we "lied" to them - they have vivid imaginary worlds, to the extent that DD1 used to leave her window open for Peter Pan, at the age of 12.
We never did the "bogeyman" aspect i.e. if you're not good, you won't get anything. For us, FC was just a benevolent, magical person who brought gifts at Christmas.
This is the first year that we won't really have FC, as My youngest DC is nearly 10, and doesn't believe any more. But they'll still have stockings, etc.
But, if you don't want to do it, well, just don't! Christmas is lovely, anyway, without FC.