Which god? One of these? All of these? Or a different one? What if you're wrong?
A, Adad, Adapa, Adrammelech, Aeon, Agasaya, Aglibol, Ahriman, Ahura Mazda, Ahurani, Ai-ada, Al-Lat, Aja, Aka, Alalu, Al-Lat, Amm, Al-Uzza (El-'Ozza or Han-Uzzai), An, Anahita, Anath (Anat), Anatu, Anbay, Anshar, Anu, Anunitu, An-Zu, Apsu, Aqhat, Ararat, Arinna, Asherali, Ashnan, Ashtoreth, Ashur, Astarte, Atar, Athirat, Athtart, Attis, Aya, Baal (Bel), Baalat (Ba'Alat), Baau, Basamum, Beelsamin, Belit-Seri, Beruth, Borak, Broxa, Caelestis, Cassios, Lebanon, Antilebanon, and Brathy, Chaos, Chemosh, Cotys, Cybele, Daena, Daevas, Dagon, Damkina, Dazimus, Derketo, Dhat-Badan, Dilmun, Dumuzi (Du'uzu), Duttur, Ea, El, Endukugga, Enki, Enlil, Ennugi, Eriskegal, Ereshkigal (Allatu), Eshara, Eshmun, Firanak, Fravashi, Gatamdug, Genea, Genos, Gestinanna, Gula, Hadad, Hannahanna, Hatti, Hea, Hiribi, The Houri, Humban, Innana, Ishkur, Ishtar, Ithm, Jamshid or Jamshyd, Jehovah, Jesus, Kabta, Kadi, Kamrusepas, Ki (Kiki), Kingu, Kolpia, Kothar-u-Khasis, Lahar, Marduk, Mari, Meni, Merodach, Misor, Moloch, Mot, Mushdama, Mylitta, Naamah, Nabu (Nebo), Nairyosangha, Nammu, Namtaru, Nanna, Nebo, Nergal, Nidaba, Ninhursag or Nintu, Ninlil, Ninsar, Nintur, Ninurta, Pa, Qadshu, Rapithwin, Resheph (Mikal or Mekal), Rimmon, Sadarnuna, Shahar, Shalim, Shamish, Shapshu, Sheger, Sin, Siris (Sirah), Taautos, Tammuz, Tanit, Taru, Tasimmet, Telipinu, Tiamat, Tishtrya, Tsehub, Utnapishtim, Utu, Wurusemu, Yam, Yarih (Yarikh), Yima, Zaba, Zababa, Zam, Zanahary (Zanaharibe), Zarpandit, Zarathustra, Zatavu, Zazavavindrano, Ziusudra, Zu (Imdugud), Zurvan
"I contend we are both atheists, I just believe in one fewer god than you do. When you understand why you dismiss all the other possible gods, you will understand why I dismiss yours."
...Stephen F Roberts