In the Christian Religion, there is only One God, who is a trinity of Father, Son and Holy Spirit.
In the Jewish Religion, there is only one God, Jehovah. In deference to Judaism, G_d is the correct spelling.
In the Islamic Religion, there is only one God, Allah, and Muhammed is his prophet. Allah has no intermediaries, no spouse, no children, and thus, Allah is One.
In the Sikh Religion, there is only One, Hari; who has many names and many forms.
In the Buddhist Religion, there are many Buddhas, but not all buddhists are deists or worshippers of Idols of Buddha. The first Buddha to attain enlightenment is Gautama Buddha, who is worshipped as a God in some strands of Buddhism. The Dalai Llama, for example comes from Tibetan Buddhism, which has deities.
In the Hindu Religion, there is one Formless God and a trinity of Creator, Preserver and Destroyer Gods. There are many other gods and consorts.
In the Parsee Religion, Zoroastrianism, there is Ormazd, sometimes called "Ahura Mazda" or simply "Mazda", the most well known of their Gods. There were other deities.
African religion has many deities; Mayan religion has many deities, Ancient Greek and Roman religions all had deities also. The American Indians had their deities, and the Australian Aboriginals had their Gods and the Dreamtime. There were Norse Gods, Scandinavian Gods, Celtic Gods, Druidic Gods, along with nature religions also. Where ever there is mankind, there you will find worshippers of the Divine.
