The sign for "church" is made by forming the letter "c" with
your dominant hand. Form your non-dominant hand into an "S" hand. Place the thumb of your
dominant hand on the back of your non-dominant hand.
When signing church, it is common to use a double movement.
Tap the thumb of your "C" hand on the back of your fist. Repeat.
Note: the movement is up and down, not circular.