Now you seem to be saying that just speaking the word, God or Goddess, makes him or her real. But which god/goddess? Thor? Hera? Venus? Jehovah? There's four more I've spoken aloud. I'll expect Xmas cards from all of them.
Xmas cards are not about God they are about celebrating the birth of Christ, and he was not a god, he was a prophet. I think that the reason you don’t believe in any god, is because you have never been taught the basics.