Why do we write “G-d” instead of spelling it out?
We’re concerned that a document containing G-d’s Name might not be treated respectfully, so we don’t spell out the Name in full. Using an abbreviation isn’t disrespectful; it’s like using “Dr.” for “Doctor”. Furthermore, we’re using the abbreviation for a respectful reason: to avoid putting the Name in a position where it might be treated disrespectfully. Using substitutes for Divine Names is an old Jewish tradition; the Tetragrammaton is never pronounced nowadays (it was pronouced by the priests when the Temple existed), but is replaced by “My L-rd”, and even the replacement is used only for sacred purposes.
