We have known about God since a very long time. We know that in Islam God name is Allah, Hinduism has many Gods and some of them are Ganesh, Vishnu and Brahma, in Hebrew God name is Yahweh, in Christianity God name is Jehovah, Chinese’s – NGod is Yang Yin, one of Greek’s Gods is Zeus and so on. We all know it, but we don’t know why in different religions God has different names and why some religions have many Gods. May be we never think about it. So my research question is why in different religions God has different names and why some religions have many Gods. In this essay I try to find out answer to these questions.
In the Christian Religion, there is only One God, who is a Trinity of Father, Son and Holy Spirit. Jesus was Jew hence He believed and worshipped the only true God Jehovah and always tried to please Him he prayed to Him and loved Him John 17:3 states this means everlasting life the taking in knowledge of YOU (prayer to Jehovah by Jesus) and the One you sent forth (Jesus) He never referred to Himself as God He never said the Holy Spirit was God. You see taking in knowledge of Jesus does not make Him God, but faith in Him is requirement for life. God cannot die but Jesus died for our sins and if we do not respect Jesus new role as Messiah we cannot gain life everlasting. Jehovah is God; Jesus is the son of God as stated in scripture. 
In the Jewish Religion, there is only one God, HaShem (The Name). In deference to Judaism, God 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. Buddha was a Hindu, so he would have been familiar with the Hindu deities. 
In the Hindu Religion, there is one Formless God and a trimurti 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. In Confucianism, there is Ti’en (Heaven). Also known as Shang Di(The Lord on High). Ancestors are also worshipped. Taoism has numerous deities. Shinto has numerous deities. Jainism has numerous deites. Africans didn’t have a religion, they had Spirituality from which ALL religions began, had Gods such as Isis, Horus, Heru, Ausar,Osirus; Mayan religion has many deities, Ancient Greek and Roman religions all had myths for example Yesus, Thor, Zeus, Mercury. 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. 
So, from this text I understand that many religions have just one God. But in some religions people believe that we more Gods and that there have certain destination. But why, maybe people were easier to believe in something, such as a God to explain different phenomena, phenomena of life or explain some occurring moments in the life of mankind.
However, why just this names? Firstly, we need to know what the name is. In the ancient world names were thought to be extremely powerful and to act, in some ways, as a separate manifestation of a person or deity.  Well, I think that God hasn’t particular name, so people named God like that, because they were based on their imagines about him. For example, Muslims, adherents of Islam named God Allah, because it is an Arabic word meaning “The God”. Greeks imagined that Zeus is the “Father of Gods”; he is the god of sky and thunder in Greek mythology, so for Greek people Zeus is the main God, because sky is impersonation of world.
But why we, people need faith in God? Faith is our motivation to fulfill our purpose. Faith and work are dependent upon one another for existence. They’re like energy and matter, Yin and yang, opposites, but complements.
Without faith it’s impossible to please God  , so our relationship with the Lord is dependent on it. Faith is what brings the things God has provided for us from the spiritual realm into the physical realm  . Our faith is the victory that enables us to overcome the world  . Everything the Lord does for us is accessed through faith. Human faith can only believe what it can see, taste, hear, smell, or feel; it’s limited to the five senses. Using natural human faith, we can sit in a chair we’ve never sat in and believe it will hold us up. We fly in airplanes when we don’t fully understand how they work, and we don’t know the pilot, but we trust that everything will be okay. That takes human faith, which God gave to every person. Yet when it comes to God, we have to believe things that we cannot see. You haven’t seen God or the devil. You haven’t seen heaven or hell. You haven’t seen sin; therefore, you wouldn’t know what you would look like if your sins were taken away. However, you have to believe in all these things to be born again. How can you believe in things you can’t see? The answer is that you can’t believe in invisible things with human faith. You need God’s supernatural faith. 
Sometimes when a person is bad, when he lost everything, he has only faith, belief in something good. We have a lot of good thoughts to believe, but the best of them is the thought of God. In some situations, only faith in God can help keep the kindness, confidence in our heart and move on.
In concluded, why in some religions have many Gods? I think in some religions people can’t prove or can’t explain some phenomenon in life, in nature, so, their think that it all happens because of Gods. For example, if the sky shines for lightning, that gods were angry at someone or at something or if the sun shines brightly, it means that the gods have good mood and they were shone by pleasure because of their eternal, divine life. So people explain all this phenomena. Fine, I have answer for this question, but I didn’t answer the question, “why in different religions God has different names?” I think because different people have a different worldview, so there have different beliefs to God, and there have different religions. If people have similar worldview, similar beliefs and have different religion I think it is wrong, because if all there thinks are similar, they don’t need different religions, and they can be one extended religion. I think people need to believe to different Gods names, because they need to prove that their thoughts are different from other. So, I think exactly because of that in different religions God has different names.