Monotheism refers to a belief system that only one God exists. Monotheists believe in one God and are Christians. They believe that God came to meet the human race in three forms: as a father, as the Lord Jesus Christ, and as the Holy Spirit. Monotheists believe in the protection of God if you don't practice monotheism.
Religions that believe in a single deity
Monotheism holds that there is only one God and is the basis for all world religions. It is distinct from polytheism (or atheism), which each attribute responsibility of reality to a separate god. Monotheistic religions hold the belief that God is all knowing and all-powerful. They are not often anthropomorphic.
Some religions are dualistic, which means that the universe is split into two basic principles: spirit and matter. This is a variation of monotheism and is found in some gnostic systems. These religions are based on esoteric knowledge and are sometimes considered heretical by orthodox Christians. The demiurge is often considered a demonic being.
Many religions have sacred texts which guide their lives. Most prominent among them are the Christian Bible, the Hebrew Scriptures, and the Islamic Qu'ran. Some religions believe these texts were written by a deity while others believe they were written by humans. Waaqeffanna in Oromo is the name of the single god. It means "the word".
Religions which are quasi-monotheistic
Religions that are quasi-monotheists have some similarities to true monotheism, but there are differences. True monotheism holds that there is one god and all other gods are illusionary. Quasimonotheism is focused on the Creator's importance in all aspects of human existence.
The idea of monotheism, and its application to religion, has its roots in the early modern era. Henry Moore, a 1660 linguist, coined the term to distinguish between Christian anthropomorphic concepts of God and Deistic ones. Later, the term monotheism was combined with the term polytheism (a concept that first appeared in the first century CE).
The ancient Greeks and Romans had monotheistic religions, and they believed in a supreme god. Their worship of Zeus signaled the transition from polytheism to monotheism, and the veneration of Zeus decreased the respect given to the fragmented powers of lesser gods.
Religions that are monotheistic
Monotheistic religions believe only in one god. Religions that believe multiple gods are called polytheistic. Monotheism is rooted in the Old Testament Hebrew Bible. Other gods can be called "false Gods". Later Christianity and Judaism started to emphasize the concept that there was only one God.
Monotheistic religions imply that one God is the only true God. All other belief systems are rejected. As such, they are often aggressive and justify their actions with the claim that their religion alone is true. In many cases, they used monotheism as an excuse for the behavior of others. This is against the religious message.
Though ancient cultures were known to worship many gods in their religions, one god was quite common. In fact, ancient civilizations considered one god superior to all other gods.