Montheism refers to the belief in one god. It is derived from the Greek words "mono," meaning one, and "theos," meaning god. This concept stands in contrast to polytheism, which is the belief in many gods, and atheism, which is the absence of belief in any gods.

Montheism is a central tenet in several major religions, including Judaism, Christianity, and Islam. These monotheistic religions teach that there is only one supreme being who is all-powerful, all-knowing, and omnipresent. This belief forms the foundation of their faith and shapes their religious practices and rituals.

Below are some key points that further explain the concept of montheism:

1. Belief in a Singular Deity: The core belief in montheism revolves around the existence of a single, supreme deity. This god is often characterized as the creator of the universe and the ultimate source of moral and spiritual guidance.

2. Unity and Oneness: Monotheistic religions emphasize the unity and oneness of their god. They perceive this deity as indivisible and without any partners or equals.

3. Exclusive Worship: Monotheistic religions teach that their god is the only one deserving of worship. Devotees are expected to direct their prayers, devotion, and religious practices solely towards this singular deity.

4. Revelation and Scripture: Monotheistic religions often believe that their god has revealed themselves to humanity through prophets or sacred texts. These revelations serve as a guide for moral conduct, spiritual enlightenment, and understanding of the divine will.

5. Monotheistic Religions: The three major monotheistic religions are Judaism, Christianity, and Islam. Each of these faiths has its own unique beliefs, practices, and religious texts, but they all share the fundamental belief in one god.

In conclusion, montheism refers to the belief in one god and is a central tenet of several major religions. It emphasizes the unity, exclusivity, and divine revelation associated with a single supreme deity.