Ajivika is a deterministic philosophy that originated in ancient India and emphasizes the concept of fate. It was founded by Makkhali Gosala in the 5th century BCE and was considered as one of the six major schools of Indian philosophy.

The question of whether Ajivika is a religious belief system is a complex one, as it depends on how we define religion. Some may argue that Ajivika is a religious belief system due to its emphasis on fate and the idea of a predetermined destiny. However, others may argue that it is more of a philosophical and ethical system rather than a religion.

One of the key beliefs of Ajivika is the concept of niyati or fate. According to this belief, everything in the universe, including human actions, is predetermined and cannot be changed. This deterministic view of the world is often associated with religious beliefs, as many religions also believe in a higher power or force that controls the destiny of individuals.

Furthermore, Ajivika also places a strong emphasis on karma and rebirth. It is believed that one's actions in this life will determine their fate in the next, and this cycle of birth and rebirth will continue until one achieves moksha or liberation. This belief in karma and rebirth is also commonly associated with religious beliefs.

On the other hand, some argue that Ajivika is more of a philosophical and ethical system rather than a religion. Unlike many religions, Ajivika does not have a specific deity or worship rituals. It also does not have a set of moral codes or guidelines to follow. Instead, it focuses on the concept of niyati and encourages individuals to accept their predetermined fate and live their lives accordingly.

Moreover, Ajivika does not have a strong emphasis on faith or belief in a higher power. Instead, it encourages individuals to use reason and logic to understand the world and their place in it. This emphasis on rationality and critical thinking is more in line with philosophical beliefs rather than religious ones.

In conclusion, the question of whether Ajivika is a religious belief system is a subjective one. While it does have some beliefs and practices that are commonly associated with religions, it also has elements that are more in line with philosophy and ethics. Ultimately, it is up to the individual to interpret and define Ajivika as either a religion or a philosophical system.