A meaning may be conveyed through spoken expression, writing, or gesture. The medium changes, but it does not follow that the meaning conveyed comes into being anew with every medium.
A teacher might say “Close the door,” write it, or communicate it by a gesture. These are different modes of expression directed to an identifiable instruction.
The human example illustrates only the distinction between signified meaning and sign. It does not attribute human mental states, a tongue, or bodily organs to God.