The way the word is used in Hebrew isn’t that meaning of vain. It is vain in the sense of “vanity.” Emptiness of speech, lying, etc.
Martin Luther interprets the commandment thusly:
You shall not misuse the name of the LORD your God.
What does this mean? We should fear and love God so that we do not curse, swear, use satanic arts, lie, or deceive by His name, but call upon it in every trouble, pray, praise, and give thanks.
And I think lying and deceiving very much encompasses the way the “Christian” Nationalists manipulate the religious.
¿Por qué no los dos?