People who trust in pagan religions believe there are many gods. These gods spend so much time squabbling among themselves that people need to make great efforts to get their attention.
The religions of the native peoples of North America are much like that, but many of them have a creation account that sounds remarkably like the one in the book of Genesis. In most cases these people believe the Creator is not much interested in their daily lives. The Great Spirit is the one that they pray to. Some tribes believe the Great Spirit is the same as the Creator and wants to help them. Others believe the Great Spirit is a powerful spirit who might do them good, but is just as likely to trick them.
Islam teaches that there is only one god. Allah sent his angel to Mohammed to dictate the words of their holy book. Their holy book is called the Koran, or Qur’an, which means recite. The whole duty of man is to submit to the teachings of the Koran. Islam means submission. Allah is far away and does not give personal answers to prayer.
Judaism believes in the God who is revealed in the Old Testament, the God who loves His people and performed many miracles for them in ages past. Now they are waiting for Messiah to come and restore them to their rightful place of glory in the world.
Christians believe in the same God as the Jews, but the New Testament reveals aspects of God that were only hinted at in the Old Testament. God loves all mankind and sent His Son, Jesus Christ, to suffer and die on the cross for the sins of all mankind. Now the way to heaven is open for anyone who will believe in Jesus. Not only that, but God has given the Holy Spirit to guide each believer through every day of his or her life.
The teaching that there is only one God, but He is three persons in order to better relate to us, is difficult to understand. Really, it is impossible for our human minds to understand just how it can be. But this is what the Bible teaches, and if we could understand everything about God, then we would think ourselves as great as He is.
The Trinity, the reality that God relates to us in three different ways, as three different persons, is what makes Christianity different than all other religions. It is what allows each one of us to know that God loves us personally, every day, wherever we are.