in the broadest sense is the belief in at least one deity.
The use of the word theism as indicating a particular doctrine of monotheism arose in the wake of the scientific revolution of the seventeenth century to contrast with the then emerging deism which contended that God " though transcendent and supreme " did not intervene in the natural world and could be known rationally but not via revelation.
is the belief that there is only one deity.
Inclusive monotheism: The belief that there is only one deity, and that all other claimed deities are just different names for it. The Hindu denomination of Smartism is an example of inclusive monotheism.
Exclusive monotheism: The belief that there is only one deity, and that all other claimed deities are distinct from it and false " either invented, demonic, or simply incorrect. Most Abrahamic religions, and certain versions of the Hindu denomination of Vaishnavism, such as ISKCON which regard the worship of anyone other than Vishnu as incorrect are examples of exclusive monotheism.
While a specific definition of theism may exclude polytheism, it is included by the most general definition. Polytheism is the belief that there is more than one deity.
In practice, polytheism is not just the belief that there are multiple gods; it usually includes belief in the existence of a specific pantheon of distinct deities.
Within polytheism there are hard and soft varieties:
Hard polytheism views the gods as being distinct and separate beings; an example of this would be ancient Greek Mythology.
Soft polytheism views the gods as being subsumed into a greater whole. Most forms of Hinduism serve as examples of soft polytheism.
Polytheism is also divided according to how the individual deities are regarded:
Pantheism and Panentheism
While a specific definition of theism may exclude pantheism, it is included by the most general definition.
Pantheism: The belief that the physical universe is equivalent to a God or Gods, and that there is no division between a Creator and the substance of its creation.
Panentheism: Like Pantheism, the belief that the physical universe is joined to a God or Gods. However, it also believes that a God or Gods are greater than the material universe.
Some philosophers find the distinction between pantheism and panentheism to be ambiguous.
While a specific definition of theism may exclude deism, it is included by the most general definition.
Deism is the belief that a god or gods exists, created the world, but does/do not alter the original plan for the universe. It typically rejects supernatural events (prophecy, miracles) and divine revelation prominent in organized religion, along with holy books and revealed religions that assert the existence of such things. Instead, Deism holds that religious beliefs must be founded on human reason and observed features of the natural world, and that these sources reveal the existence of a supreme being as creator.
Pandeism: The belief that God preceded the universe and created it, but is now equivalent with it.
Panendeism combines deism with panentheism, believing the universe is a part (but not the whole) of deity
Polydeism: The belief that multiple gods existed, but do not intervene with the universe.
While a specific definition of theism may exclude autotheism, it is included by the most general definition. Autotheism is the viewpoint that, whether divinity is also external or not, it is inherently within 'oneself' and that one's duty is to become perfect; divine. This can either be in a selfish, wilful, egotistical way or a selfless way following the implications of Jesus Christ's statements and canon, outright suggestions made by him,[vague] Buddha,
and other ethical philosophy/religion founders.
"What is atheism?"
Atheism is characterized by an absence of belief in the existence of gods. This absence of belief generally comes about either through deliberate choice, or from an inherent inability to believe religious teachings which seem literally incredible. It is not a lack of belief born out of simple ignorance of religious teachings.
Some atheists go beyond a mere absence of belief in gods: they actively believe that particular gods, or all gods, do not exist. Just lacking belief in Gods is often referred to as the "weak atheist" position; whereas believing that gods do not (or cannot) exist is known as "strong atheism."
.........................Then what is this true 'Believism'